Mixtures discussed are
1. Phthalo Green + Permanent Alizarin Crimson
2. French Ultramarine + Burnt Sienna
3. Crimson Red + Phthalo Blue (Green Shade)
These are convenient colours for mixing grays and black.
Or use Transparent Pyrrole Orange (transparent) instead of Cadmium Red.
To get grays, just dilute with more water.
Part 2 of mixing grays and blacks:
https://youtu.be/r5Axcx-KLf4
Here are links mentioned:
Scans of my demonstration:
http://www.parkablogs.com/node/12173
ARTGRAF watersoluble graphite:
http://www.parkablogs.com/node/10873
Watercolour box I used
http://www.parkablogs.com/node/6006
Books & videos relating to colour mixing:
http://www.parkablogs.com/tags/colour-mixing
Find me also on
Youtube: https://www.youtube.com/user/teohyc
ParkaBlogs: http://www.parkablogs.com
Facebook: https://www.facebook.com/parkablogs
Twitter: https://twitter.com/ParkaBlogs
G+: https://plus.google.com/u/0/+TeohYiChie
Flickr: https://www.flickr.com/photos/parkablogs
Tumblr: http://parkablogs.tumblr.com
Instagram: https://instagram.com/parkablogs
Patreon: https://www.patreon.com/parkablogs