Oreo, and their parent company Kraft, caused a stir recently after pledging support for gay pride by posting the above image on their Facebook fan page along with the message “Proudly support love!”. While most applauded this public action a small minority voiced their objections and began threatening to boycott Kraft products, and, not long after, the image was pulled from the page. This was saddening for many reasons; one of which was that it made it even less likely that such a fabulous looking biscuit sandwich would ever exist… but this biscuit had to happen. So, a purchase of many Oreo biscuits later:
Along with some food colouring and brushes:
We set about de-constructing biscuits and painting the fillings various colours
It was messy, it took longer than expected, and there were many casualties but the Rainbow Oreo was born.
Its life was short lived though. During some experimental squishing in order to get the filling to reach the edges like in the Facebook image the better looking of the biscuits was damaged. This was met with swift retaliation resulting in the inferior biscuit getting Hulk smooshed. It was not in vain though, the biscuits (whether smooshed, broken, or boring old non-rainbow) were all consumed and tasted delicious.
As a continuation of the attempts at rapid infusion, this experiment tries to mimic the one Dave Arnold demonstrated in the first public Harvard lecture on Science and Cooking in which he created coffee vodka.
The Theory and Technique
The most common way for infusing coffee is by brewing it in hot water however, if you’re wanting to drink the coffee cold, letting it cool will result in an overwhelming astringent flavour. This is due the chlorogenic acid in the coffee forming quinic acid as it cools. In order to reduce this apparent acidity the coffee needs to be brewed in a way that does not involve heat. Cold brewing coffee is easy enough but it takes considerably longer (sometimes 12-24 hours) so, just as with the vanilla extract experiment, this aims to drastically reduce that time to a few minutes. As this builds upon the vanilla extract experiment the theory and technique are the same so no need to repeat that here however it is probably worth mentioning that the N2O will add a slight sweetness to the coffee (whereas using CO2 would add a metallic-like tang).
The Experiment
0.5L cream whipper
8g N2O chargers
Coffee grinder
Measuring jug
Coffee filters
0.5L Smirnoff vodka
500g Coffee beans
Something to compare against – Since the coffee vodka is made to go with cream and milk the comparator for this experiment would be a White Russian which is a mixture of Kahula, cream, full fat milk and vodka.
The Process
Grind 500g of fresh coffee beans as fine as possible and add into the cream whipper.
Add 0.5L of vodka to cream whipper.
Seal up the whipper, add charges, and give it all a bit of a shake.
Leave to sit for 2 minutes.
Keeping the whipper upright to minimise blockages, vent all of the gas in one go. This will be extremely messy so you’ll want to have something to catch all the foam. Even once you think all the gas has been vented be sure to give the handle an extra squeeze or two as it’s possible the grounds may have blocked the valve. You really don’t want to be opening the canister while it’s still pressurised as it’ll spew the contents everywhere.
With the canister vented it’s time to filter the coffee grounds from our vodka solution using the filters. You’ll probably want to filter the mixture at least twice.
Enjoy!
Taste Test, Conclusion and the Future
For the taste test we added some full fat milk and cream to 25ml of coffee vodka and mixed some White Russians (25ml Kahula, 25ml vodka, milk). The White Russian was inherently a lot sweeter due to the Kahula while the coffee vodka was extremely bitter and intense. This is likely due to having used expresso beans so for future testing a less intense bean would be better. Better results would probably be achieved if we ground the beans finer and did an additional filter process.
I’ve been wanting to try make some simple documentation videos for a while now and as I’m generally a Mac user I’ve been attempting to learn how to use the basic features of iMovie. Luckily enough, I recently managed to capture Tom Wyatt and Thomas Greer showing off their Nerf gun project so used that as the basis for my first video as it seemed like a nice easy starting point.
I was using a Samsung Galaxy Nexus so it’s not the best quality video out there and it’s a bit shaky despite my attempts at using post processing video stabilisation but I think it’s not too bad for a first attempt at using the software and making videos. It’s definitely worth noting though that if you attempt to use iMovie’s video stabilisation on a mp4 format video file it will error during the last stages of the process so you have to first convert the file to another format if you want to make use of that feature, which is a rather annoying and a major time waste (especially as the error doesn’t tell you why it didn’t work and you end up having to Google the problem).
After that I turned to something I thought would be a little harder, turning some older pictures I had taken using a GoPro HD Hero2 into a time lapse video. The GoPro comes with a configurable mode for taking time lapse shots and I had used this set on an interval of 30 seconds to capture Heather constructing her Ice Tube Clock. It was a bit fiddly getting the resulting pictures to work properly in iMovie since it defaults to crop and transition over any used photograph rather than just simply display them and the software seemed a bit flaky when telling it to “Fit” (what you have to set in order to prevent the croppy-transition-ness) on a large selection of pictures but I got it to work in the end. In all, the build took about 3 hours and the resulting video was roughly 1 minute 10 seconds long.
There are probably better programs out there than iMovie but, for now, it does what I want so the learning continues…
Making vanilla extract is typically a slow process involving steeping spliced vanilla pods in vodka for months or even years and is considered to age like wine, getting better over time, even once the pods are filtered out after 6-12 months. After watching the first public Harvard lecture on Science and Cooking, in which infusion techniques were discussed, and reading Dave Arnold’s blog post, where he outlines some of the research he did on rapid infusion using pressure, I began to wonder if vanilla extraction could be sped up in a similar way.
The Technique
The process is pretty simple; put a solvent along with a porous substance into a pressure chamber, increase the pressure in the chamber by adding a gas, leave for a minute or two, then vent the gas rapidly. In the case of vanilla extraction, rather obviously, the solvent is vodka and the porous substance is vanilla pods. As for the pressure chamber and gas, a cream whipper and N20 (also known as laughing gas or nitrous oxide) are used as they are relatively cheap and easy to come by due to being regularly used in the culinary industry and, unlike soda streams and CO2, produce hardly any noticeable effect on the flavour of the final product.
The Theory
The premise is that the added pressure of the gas forces the solvent to permeate the porous substance where any solutes will be collected and that then venting violently causes the solution, and possibly some of the insolubles, to rapidly rush out of the substance in order to establish an equilibrium. So, for the vanilla extraction the vodka would be permeating the vanilla pods’ cellular membranes, where it takes on the flavours of the vanilla then, during the venting, the vodka solution would be pulling out those flavours and any oils, essentially accelerating the process of osmosis that would normally occur.
So what’s the catch? Well, depending on what you’re infusing, the longer you leave it the greater the infusion but it will also be more bitter and harsh.
The Experiment
To test if this technique would work with vanilla extraction the following was required:
0.5L cream whipper
8g N2O chargers
Measuring jug
Filters or Sieve
0.5L Smirnoff vodka – The brand doesn’t matter, most people seem to say use the cheapest, but it does needs to be a minimum of 35% proof (although some sources say 40% proof) if you want to call it vanilla extract due to trading standards.
Grade ‘B’ Vanilla pods – Sometimes called Extract Grade Vanilla pods. Recipes state a minimum of 8 pods per 250ml of vodka and that you can never have too many. I decided to use 32 pods for my 500ml mix, to make it double strength, since the pods only cost £8 for 100 off of eBay.
Brown bottles – These are to store the finished product. You can apparently use clear bottles if you store the stuff in a dark place but brown is preferred, especially while pods are still present in the solution, as it minimises the amount of light so reduces the ability for anything nasty to grow in it.
Something to compare against – You can’t have a food hacking session without a taste test, especially when alcohol is involved!
The Process
Measure out 500ml of vodka and pour into the cream whipper.
Splice the vanilla pods, scrape out the seeds, and chop up before placing everything into cream whipper.
Seal the cream whipper and use one of the N2O chargers. You could use an extra charge to get added pressure and presumably get more infusion. I had to use a second one because I had forgotten to vent the gas all in one go so was worried I didn’t have a proper infusion and there was a noticeable taste improvement over what was vented the second time over the first.
Shake up the whipper a few times and leave for 2 minutes.
Keeping the whipper upright, to minimise blockages, vent all of the gas in one go. This will be extremely messy so you’ll want to have something to catch all the foam. Even once you think all the gas has been vented be sure to give the handle an extra squeeze or two as it’s possible for the pods to block the valve. You really don’t want to be opening the canister while it’s still pressurised as it’ll spew the contents everywhere.
With the cream whipper’s gas vented it’s now ok to empty the contents. Depending on whether you plan to use the product as is or to carry on the steeping but in a more traditional way you may want to filter the contents. For this test I did half and half, bottling up some with pod bits and bottling some all filtered, minimal bits.
Enjoy your tasty vanilla extract (or Kraken tentacles)!
Taste Test, Conclusion and the Future
For the taste test we had a range of vanilla extract products from cheap, midrange, posh, Heather’s own slow steeped homebrew, and even a super cheap “vanilla flavouring” product. Surprisingly the rapid infusion was up there with the posh stuff and slow steeped homebrew but we can’t be certain until we have a bake off!
As for the future, I definitely foresee some fresh ground coffee beans and vodka infusions.
Recently the Otter’s Pocket, the London Hackspace’s wet room, was kindly donated photograph developing equipment from Lester after Heather, Tom, Phil, and Paddy had finished converting the room to also function as a dark room. All that’s now left to do is test everything works and tonight I had the chance to help Heather with the first test run of the equipment.
We were a bit slow to get started so only managed to get 3 photographs developed, 2 were mine and 1 was Heather’s. Heather developed a 35mm shot she had taken of a wall in Barnet Market (more info). She scanned all the prints so here on the left is her test print and on the right is the end result.
The two photographs I chose to develop were taken back around 2003 as part of activities week at Coulsdon College using a 35mm Canon SLR. The first photograph was taken in Trafalgar Square while on the first day trip around London. It’s a bit underexposed and a bit out of focus but I felt it wasn’t bad for a first attempt.
The second shot was taken on the first day that we were loaned the cameras while on the journey home. I was with a couple of other friends on the old slam door trains trying to take a picture but the shutter button jammed and I ended up taking this shot. There was a watermark on the negative, which is visible in the first two pictures, so I decided to edit the picture a bit to clean up all the dust, scratches, and marks. Much more pleased with this one.
Apart from an initial accidental exposure, due to forgetting to turn the enlarger off, things went pretty well. It was awesome to finally get a chance at developing some of the photographs that I didn’t have time to do during activities week. Now I just have to find time to develop the rest before giving my Canon Canonet it’s first use in over 20 years.
Things to note:
Larger (layout breaking) versions of the scanned prints can be found in the Gallery album.
Heather is a rebel. What kind of person would put the developer in the tray labelled fix and the fix in the tray labelled developer?!
Singing “ROXXXXAANNNNEEEE!!!” every time the safe/red light is on never gets old. In fact, I would say it’s compulsory.
The grain magnifier is a strange beast that can easily lure you into a few moments of derp.
Back in January, Sky 1 started airing the show Gadget Geeks, which stars the London Hackspace members Charles Yarnold and Tom Scott. In order to provide support members of the Hackspace decided to watch the show together, with Tom and Charles providing live commentary of behind the scenes going ons, while simultaneously having Twitterfall projected onto a spare wall (dubbed ‘The Wall of Hate’) in order to see public feedback of the show. In addition to this it was joked that there should be a drinking game for when watching the show. That joke became a reality which I went on to use as the basis for @TVDrinkingGames.
@TVDrinkingGames on Twitter
@TVDrinkingGames is simply a Twitter account that tweets during the show telling people when they should drink, with the participants being expected to be responsible, know their limits, and not feel restricted to solely consuming alcoholic beverages (e.g. Club Mate makes a nice alternative). @TVDrinkingGames is so basic that it’s not doing any subtitle parsing or computer vision. It’s just me using a web interface to quickly send tweets when I spot a drink cue. It’s written in Python and makes use of the web framework Pylons in order to provide the user interface and the Python Twitter API in order for my code to be able to send tweets.
The web interface for @TVDrinkingGames.
The web interface for sending the tweets is similarly basic. It consists of a list of each of the drink cues and a submit button. Clicking the submit button sends the unique ID for that cue to the backend which then performs a lookup to get the string to be Tweeted, appends the episode number as well as the number of occurrences of that cue for that episode. The reason for the count is that very early on I realised Twitter wouldn’t publish my tweets if the exact same content was sent in quick succession so by appending the count I can make the tweet appear to be unique.
@TVDrinkGames is currently only used for Gadget Geeks but I would like to make use of it during the Eurovision Song Contest. Possibly adding the ability for it to pick up on other people’s tweets in order to trigger cues, parsing TV subtitles for instances of commentators saying something, or even being able to detect key changes in the music.
In an attempt to gain a sixth sense for the electromagnetic fields around me but without resorting to Steve Haworth-like implants I decided to experiment with small (2mm x 1mm) N45 Neodymium magnets and nail polish.
After playing around with various numbers of magnets and formations I came to the conclusion that it was best to have a few lining the edges of my nails. That way I could feel the magnets move against skin (which would be more sensitive than the nail area) while the magnets could be firmly attached to the nails. I also found that trying to place as many magnets as possible on a nail had the problem of them pulling together and detaching due to the nail surface being curved, as well as having the undesired effect of being shiny and eye catching.
The end result was slightly reminiscent of the website Human Upgrades. Sadly though I can’t feel the oscillations as described with the implant equivalents but I can feel the presence of magnets nearby such as near the speakers or the lid of my laptop. The sensation is similar to someone tugging at your nail (obviously) but also feels a bit like when the hairs on your arm stand on end. A future attempt will probably involve slightly larger magnets and perhaps attaching the magnets to the fingertip rather than nail.
Plasticine is awesome fun! Last time I played with the stuff must have been about two decades ago but lately I’ve had an inkling to try make little models so I’ve been testing out ideas and trying to make humanoid figures.
The plan is to eventually use some of the models to make moulds in which I can cast concrete statues but the liquid polyurethane I intend to use is rather expensive (roughly £100 for 5KG) so I’m currently toying with different size models to see how difficult it is to get the level of detail I want for the final designs.
During a late night session at the London Hackspace I had the opportunity to learn how to use kiln with the aid of Billy and Sam. We took dead hard drives, dismantled them, broke the cases into small pieces, and smelted them in order to extract the aluminium. Once we had a small stock of aluminium ingots we made a closed cast sand mould of a 3D printed model of a 3D scanned face
With mould ready, we melted down the ingots and poured the molten aluminium to make this small cast
As featured in ‘The IT Crowd’, the internet is surprisingly small, wireless, and, due to not weighing anything, really light. Unsurprising, it’s also really easy to get your hands on your very own Internet.
Remove Orange 5mm LED from bezel with the aid of heat gun.
Hot glue Red 5mm Flashing LED into bezel.
Attach bezel to ABS box.
Solder wires to contacts of CR2032 battery holder, may require scuffing the contacts of the holder and wiping with flux.
Hot glue CR2032 battery holder into lid of ABS Box.
Solder resistor to Red 5mm Flashing LED.
Solder wires of CR2032 battery holder to Red 5mm Flashing LED and resistor, ensuring the middle pin of the CR2032 battery holder is soldered to the short leg of the Red 5mm Flashing LED.
Gallery
Alternative Builds
While making this I found someone else had done something very similar but a tiny bit more complicated and expensive Instructables version.
