I think they're imprecise translations of acutance dye (yellow) and anti-halation backing (red), both of which are characteristic of various normal-ish contrast technical films like Kodak Gravure Positive film. These dyes are usually destroyed/ removed in processing - 4135 Gravure Positive tends to make the developer rather pink/ red. And a step wedge is not what you need at this stage, rather more useful would be a specification of the potential contrast ranges it can be developed to in various developers. A step wedge of one contrast/ process situation would be at best only a very partial description. The Bergger film might have a relationship to Agfa Avitone P3p-HR in emulsions & manufacture - some of the specifications and descriptions track rather closely.
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