Stuart Semple launched a Kickstarter for Black 3.0 and the paint absorbs 99% of light. Check it out on Kickstarter.

Black 3.0 is a super special acrylic paint. We have spent nearly 2 years tweaking its formulation to create a black that absorbs between 98 and 99% of visible light! Quite simply we’ve created the blackest black acrylic paint.