[clarii_d] is currently finishing up her thesis project on thermochromic pigment to silkscreen receipts. The idea behind it is that when a receipt is touched, part of it fades revealing a hidden message.
As you can guess, thermochromic paint is a type of substance that changes color when introduced to heat — or in this case, fades altogether. Remember when mood rings were all the rage? Same thing.
In her project she is using silkscreening to transfer text onto the back of receipt paper using regular ink. Once dried, she silkscreens an image over top of the message, this time using a thermochromic pigment. The result is a slightly obscured image, but after holding it for a few seconds, it disappears and only the text remains.
Color-changing anything is a bit gimmicky, but we think [clarii_d’s] project is a pretty cool and unique application of it. A few years ago we shared another interesting project utilizing thermochromism; a color-changing clock face that utilized the heat given off by resistors!
I don’t see any reference to receipt paper in the instructables, it only mentioned to try out your positioning on newsprint before you use the good paper.
Is there a link to the thesis?
A lot of till receipts are printed on heat sensitive paper. If you heat it up it just goes black, which may add an interesting additional dimension.
I came to say something similar. Thermal paper is full of tricks.
Further, most of the big payroll companies already have heat sensitive inks on their cut checks as an anti-forgery measure. Hiding a message may be novel, but I am uncertain what could be done with the technique (other than write a paper about it).
Let’s not forget Hypercolor shirts!
I think fashion has been trying it’s best to. “Nice purple armpits!” “Thanks!”
And these would be useful for…….?
The Fubarino Easter Egg contest… the ink fades to reveal Hackaday.com printed underneath! Good enough for me!
reminds me of the Nine Inch Nails – Year Zero cd. It was all blue, but after spinning in the cd player for a bit it would heat up and turn yellow with blue 1’s and 0’s that spelled a secret message. Part of the ARG story campaign that went with the album.
Please be careful, as I understand it, the receipt paper contains huge amounts of “bisphenol s” which is both a toxic *endocrine disruptor* and an ‘obesogen’ a chemical that causes morbid obesity in the exposed and their offspring.
See http://www.ncbi.nlm.nih.gov/pubmed?linkname=pubmed_pubmed&from_uid=22591511
Bisphenol s, a new bisphenol analogue, in paper products and currency bills and its association with bisphenol a residues.
Liao C, Liu F, Kannan K.
Environ Sci Technol. 2012 Jun 19;46(12):6515-22. doi: 10.1021/es300876n. Epub 2012 May 25.
PMID:
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[PubMed – indexed for MEDLINE]
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Widespread occurrence of bisphenol A in paper and paper products: implications for human exposure.
Liao C, Kannan K.
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Liao C, Liu F, Guo Y, Moon HB, Nakata H, Wu Q, Kannan K.
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Concentrations and profiles of bisphenol A and other bisphenol analogues in foodstuffs from the United States and their implications for human exposure.
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Now I really like papers, and really like it when people put the effort in to finding them. However it is of no value if the citations require me to pay 20-60 bucks a shot to read them.
Maybe it’s them “obesogens” in all the biscuits I shove down my face that’ve given me this belly! The bastards!
For the endocrines, I still can’t grow a proper beard and I didn’t really fancy having organic children anyway.