1 comment

  • Steve N.

    I used a manual system to make printed circuit boards at UIC in the late 60s.
    The image was transferred to a thin tissue-like paper shiny on one side to hold the toner (via another charge step). Then transferred to the Copper clad board via a third charge step.
    That system used a solvent to melt the toner on the paper, or in this case, the circuit board making it an etch resist.
    - –
    Regards, Steve N.
    Science Vigilante

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