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Michele,
He said not to use them, I have notes, I will see if I can find them.
His knowledge is quite encyclopedic and my poor brain could not quite contain the amount of information he delved out.
He went into the types of canvas, the weave, twill or regular and what effect where the flax was grown to the quality of its' use as a paint surface.
I did a bit of research last spring and I was disappointed in the lack of good painting surfaces. One reason lead gessoing is so desirable is its' flexibilty and durability. Unfortunately good prepared lead gessoed canvas is rare. But this is going beyond the purview of this thread.
As to alizarin, I am wary of using Gamblin as they use an alkali refined linseed oil as opposed to a cold-pressed linseed oil more common in European oil paint manufacture. According to Ralph Mayer, cold pressed is more durable and it does not have a suede effect. That is when a paint color changes as a result of the direction of a paint stroke.
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