FWIW, Kodak does still have the Crocein Scarlet negative retouching dye in their catalog. The local store here still carries the 1oz bottle of powder, roughly enough for three generations of photographers.
KODAK Crocein Scarlet
For use on negatives as retouching or dodging dye. Also for
masking pinholes and scratches, opaquing large areas,
lightening shadows, intensifying highlights, etc.
• Red color identifies retouched areas
146 3751 1-ounce bottle $24.15