GOLDEN® Color Mixer, © 2018 Golden Artist Colors, Inc.
Powered by PaintEngine™, © 2018 PaintLife Pty Ltd.
https://goldenpaints.com/mixer
Mixing acrylic paints based on the HLC Color Atlas
and the color system
Sirius® Primary Acryl-System
https://www.backes-art.de/en/page/_acrylfarbenmischen/