Munsell notations for oil and acrylic colours–very useful. From the magazine Just Paint put out periodically by the manufacturer of Golden Acrylic Paints and Williamsburg Oils.

http://www.justpaint.org/munsell-notations-for-golden-and-williamsburg-paints/

Loose painting and how not to get there–sensible advice from Paul Foxton (like happiness, striving for it is the opposite of wisdom).

http://www.learning-to-see.co.uk/how-to-loosen-up-your-painting-and-why-you-shouldnt-do-it?utm_source=ck&utm_medium=email&utm_campaign=loose

Beyond the concept of warm and cool– great painting webinar from the wonderful Paul Foxton

http://www.learning-to-see.co.uk/warm-and-cool-free-webinar

To work from photos or not? The case against:

Some interesting points made in this blog: http://blog.oilpaintersofamerica.com/2012/08/paint-from-life-or-photos/

The Colour of Art pigment database–fantastically useful if you’re looking for a paint containing a specific pigment

http://www.artiscreation.com/red.html#PR264   image above from the extremely useful Dick Blick website to which this pigment database links.

Preparing a canvas for painting–from Golden’s Just Paint newsletter

Many thanks to Golden for this article showing the results of tests of various "sizes" (ways of sealing canvas) including RSG. Image from same source. http://www.justpaint.org/preparing-a-canvas-for-oil-painting/

Comparison of aging (yellowing) white oil paints–thanks Jonathan Linton!

http://blog.jonathanlinton.com/2010/05/white-test-5-years-in-making.html