this post was submitted on 07 Dec 2023
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Laser printers have existed for a long time and they don't use ink, but they do use toner. I'm gonna assume just scorching the paper has been proven to be a bad idea, because someone would have tried to market a toner-free printer by now otherwise.
My best guess is that it's very hard to scorch paper to a color anywhere near black without creating a serious fire hazard. Even if you could calibrate the laser just right, the next batch of paper could burn because it has a slightly different weight, texture, or composition.
You'd probably end up being special paper stuff something in it that turns black at a fairly low temperature. That's pretty common for things like receipt printers.
Zink Paper is an alternative but nowhere as cheap as regular paper+ink