I can't work out how you could reliably get good colour rendition from these.
I know how conventional monochrome thermal printers work - the printer simply heats up part of the print head, and as the paper rolls past, the heat causes a chemical reaction converting a white 'pre-ink' into a black ink.
But how do the new colour versions work? Are there different inks, which respond to different temperatures - e.g. apply 50C to start producing cyan, apply 100c for yellow, etc.
I know how conventional monochrome thermal printers work - the printer simply heats up part of the print head, and as the paper rolls past, the heat causes a chemical reaction converting a white 'pre-ink' into a black ink.
But how do the new colour versions work? Are there different inks, which respond to different temperatures - e.g. apply 50C to start producing cyan, apply 100c for yellow, etc.