Imaging with Dry Film and Related Processing Equipment for Chemical Milling Application
There is a tradition of several centuries to
the principle of structuring materials such
as glass, metal and minerals by wet
chemical etching while protecting certain
surface parts with resist layers.
Such resists would be applied either
singly according to the desired image, or
solidly, and then mechanically removed for stencil production.
In the Renaissance, for instance, iron armour used to be decorated with a vinegar-based etching medium and a resist based on linseed
Raymond Werner, Ludwig Shafen Company