Just a friendly reminder that most common types of thermal paper contain BPA or BPS. You really should be avoiding these endocrine disruptors when possible.
https://www.pca.state.mn.us/green-chemistry/bpa-thermal-pape...
https://www.pca.state.mn.us/green-chemistry/bpa-thermal-pape...
The European Union decided in 2016 to forbid the use of BPA in thermal paper. [1] BPA is currently still used but will be completely banned in 2020. And, even if BPS will be allowed, EU surveys seem to show that alternatives to BPA/BPS are being considered for thermal paper.
So, in fact, it is valid to say that "most common types of thermal paper contain BPA and BPS."
If you really think I was shitting on the project, my apologies. I prefaced the sentence with "friendly reminder" as in "hey, perhaps this is something you should know about your materials, just like working with tritium".
And, at the end of the day, I didn't upvote myself this far. So ¯\_(ツ)_/¯.
(And for the record, the project is pretty neat).
but yeah, sometimes that does turn into a kind of contest where someone tries hard to find the detail that will mark them as an expert. That can be very tiring. If people try too hard, it shows and makes others tired.