Geiss is also the word for coat. So, we have an ambiguity here that I have not figured out.
The Japanese word for their coating operation is "Lay" and I used that early on at Kodak after a tour of the Japanese plant. It got quite a laugh from my co-workers. Each "secret" manufacturing facility uses their own terminology. When I teach, I use Kodak terminology. For example, we do not "confection" at Kodak, we finish or package.
As an afterthought, Erythrosine is so hard to adsorb to an emulsion, it is often added before precipitation so I cannot see it being added as an overcoat. Other dyes can probably be added in an overcoat.