PBR Color Reference List & Color Calibration for PBR Materials guide

This list is imho a 'must have' for everyone who works on materials. It is something I use on a daily basis and can't imagine working without it. It took me over two years of research to make this version and I hope it is going to help everyone the same way it helps me:

The product itself contains:
- PBR Color Reference List
and
- Color Calibration for PBR Materials (comprehensive guide)
and is available to purchase in here:

https://gbaran.gumroad.com/l/rjthlk

I plan to keep it under constant developement and update it as soon I get more substances covered. The list at current stage contains over 500 substance samples and I would consider it as a fully functional one.

Thank you for your support,
G.