Quote Originally Posted by holmburgers View Post
...what about etching onto a sheet of metal?
Woods interference screens/diffraction gratings are similar to the "pellicles" used in one-shot cameras. The Devin-McGraw pellicles were made by pouring gelatin onto a ronchi grating (chrome on glass plate) and then stripped off when set. It would seem that an etched metal plate, as you suggest, would work as well.

BTW: The Frontispiece of A Handbook of Photography in Colours was the first published "natural" color photograph.