Just enough to let some more light come through...this Flex stuff cures a basically opaque off-white color. I've checked different products from both Alumilite and Smooth-On without finding any options that are safe to use at home without industrial grade safety equipment. Attached below is a picture of one of my failed trial pours, but it shows the transparency without any colorants added.
Hey Will, I remember now that you mentioned the Flex 30 in a prior conversation! I have tried both powder/dust and dye colorants with success! It's to my knowledge that the harder Flex series cure a different color so it might be different for you, but since the Flex 70 cures an off white the final product will be significantly lighter than when you go to pour it. Overall I'm very happy with the Flex series...I just wish it cured a more translucent hue.
Thanks for the replies, gentlemen!