Geiss = Goat and Giess = Coat (pour). Just a spelling error.
Notwithstanding my spelling error, an Agfa coating machine was called Giessmachin or pouring machine. So we have a problem about whether the 6 (plus several left out of the list) ingredients given in published Brovira formulas were poured into the emulsion or coated with it or over it.
Lets just leave it ambiguous and say that many ingredients including some type of sensitizing dye were added to the Brovira and Portriga formulas. Included in this mix was an unknown dye and Erythrosine depending on product.
That might be a suitable summary.