Bingo, I have one Phasor printer still intact, and in perfect working order, you just need wax ink at $200 per pack of 3 blocks, which it will happily consume in a month even if you do not print a single page. If you turn it on it does a clean cycle, which uses a half block of each of the Cyan, Magenta, yellow and Black ( black is free BTW) wax blocks.
I used to print a lot of jobs to that printer with a black background and white text, just because it was so good at making a very good dense black print, and of course it actually does not cost any more, it will have dumped that black wax in the maintenance tray in any case.
There was one DTP graphics shop with a dozen of these printers, and a salon next door, which used the black wax blocks to darken the regular pale wax to do hair removal, sort of as a differentiator.
Beeswax is not hygroscopic, and is traditionally used as a protective coat in RF circuits, you will have come across it in older transistor radios as a coating applied to the FM RF and AM RF sections to keep them all from vibrating or moving if dropped. Melts in boiling water or a double boiler for you to pour into a mould, and is soft enough and flexible enough to enable rework without taking it all off.