Home made UV dyes

[Elpy]

Hey something I started wondering. The staining. I dont really mind staining the tubing like I've said before, but how about blocks staining? Do blocks really stain badly? Or will the color just make a "layer" on them but can be easily cleaned off. Just having some 2nd thoughts whether i should use the blue dye or just stick to UV blue. Blocks will be nickeled and I dont want them to end up blue for life and neither in a shape where I would have to use smth like vinegar to clean them.

edit: oh and how's acrylic...? Will use a EK multioption..