Sure you can
https://www.wikihow.com/Dye-Rubber

Look it up on google. But dyes could possibly work for you, check with the brand.

have you tried your tube or pinterest as they often have good ideas to do crafty things.

Surely it’s possible!

Inks or permanent dyes might be the go

I’ve got a feeling it can be stained. You’d probably need to use inks or something. It depends on the type of rubber too.

I don’t think you can dye rubber. You could try painting it.

Interesting question! What are you wanting to dye?

Hasn’t thus question already been asked on here? From memory, I think the answer is no as it’s a non porous surface