
These were of course applied to degreased plates / zinc for the car spray / copper for the pump spray. The zinc plate was etched in copper sulphate crystals mordant (with salt).
I most generally refer to that as"salt etch", and the copper in ferric chloride mordant. So these are photos of the actual copper plate and then the zinc plate. It's amazing how calmly and deftly Bill is able to get a lovely velvety spray onto the zinc!!! I seem to remember that I proofed both of these before putting them in the mordants I usually do this if it is possible so that I can get an idea of how much of the plate is open to the mordant.



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