Flexible 80A + Pigment

I’m trying to find more information about adding pigment to 80A flexible resin. How much can I add? I want to try making it black but I’d be interesting to hear about other options too. THanks

Formlabs uses it for their soft tissue prints. You can see the guide here
-ENUS-Soft-Tissue-Application-Guide.pdf (formlabs.com)

They only replace 40 ml of the flex resin, not sure how the properties change if changing the ratio.

I think this link might help you, if you are still interested. Formlabs Medical: The Ultimate Guide to Dyeing, Painting, and Coloring SLA Parts