You may have missed this but the terminology is connected to the Pina Cryptol family of dyes. It has been found that more than one SO3- group is useful in making the dye fast in gelatin and even mordants are used.

The archetype dyes of this nature today are the Solantine class (Solantine Pink and Solantine Yellow) and then there is my old favorite Chicago Blue. A mix of the pink and yellow will probably satisfy the Capstaf short wavelength dye, and Chicago Blue itself will supply the long wavelength dye.

The PINA designation is no longer used.