On Wed, Jan 25, 2023 at 02:03:43PM -0500, bob jeffway.com via vcf-midatlantic wrote: I agree on Tektronix. When I was at UMASS in the 70's, we had a printer on the Tektronix 4012 that had some strange paper like that. White crystals grew on the case where the paper came out - kind of strange, I wonder what the technology was? What I am familiar with for the storage tube machines used dry silver paper. It was exposed by a line CRT in the printer then developed with heat. https://w140.com/tekwiki/wiki/4631 Earlier 4610. Title is wrong. https://www.computerhistory.org/collections/catalog/102662132 They did make a electrostatic one. Never saw it in person. Did use 4610 and 4631 when they were current. https://www.electronixandmore.com/misc/index.php?item=53. This sound different than the aluminum coated paper type previously discussed since it uses toner.