Re: Stand oil as a glaze

In Reply to: Re: Stand oil as a glaze posted by bri on 07/27/00 at 1:49 AM:

There was a lot of confusion concerning resins in oil paints. Max Doerner made some assumptions that appeared to be correct at the time. He assumed a fair amount of resins in many of the old master's works. Armed with that knowledge he set up the Doerner Institute where his students put his teachings into practice. They also stored their student works there. Twenty-five years later, those paintings exhibited every flaw attributed to oil. They darkened, cracked and were disintegrating.

That, to me, is a clear warning to back off on the proportion of resin to oil. The STANDARD ART SCHOOL PAINTING MEDIUM of 1/3 turps, 1/3 damar varnish and 1/3 nameless oil dries to have much more than 1/3 resin in it because the turps evaporates leaving only dried resin and the solids in oil in equal proportion.

Currently, we are in the process of making a video on the subject of oil painting mediums; what they are, what they do and how to use and make them. It's a very complex subject which is awash with rumor and unadulterated BS. We hope to demystify the subject without having to anaestethize the viewer with a long discussion about aromatic benzene rings and free radicals.

Retouch varnish is made from a stock solution of damar resin crystals dissolved in turpentine. The stock solution is further diluted with turpentine. You cannot use "turpenoid" or those low-odor thinners because they are nothing but mineral spirits and they turn damar cloudy. The dilutions of retouch varnish make it useful for interim coats but useless as an additive to a medium.

Mayer's discussion about the chemistry of paint is the most knowledgeable aspect of his book.

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Is there a percentage or general rule of thumb concerning the amount of resin that can be safely added to oil to retain its adhesiveness or does this depend on what oil and/or which resin(s) are being used, or the application???

Should a retouch varnish contain or be mixed with turpentine???

Are the details of Ralph Mayer's information reliable concerning:

1> resins???

2> the mixture of
oils and resins

Re: Stand oil as a glaze joseph   Posted at: 08/15/00 (0)
Re: Stand oil as a glaze Stump   Posted at: 07/27/00 (12)
Re: Stand oil as a glaze rob howard   Posted at: 07/27/00 (11)
Re: Stand oil as a glaze Stump   Posted at: 07/27/00 (10)
Re: Stand oil as a glaze Jean Shepard   Posted at: 07/29/00 (7)
Art Students League Stump   Posted at: 08/02/00 (3)
Re: Art Students League rhoward   Posted at: 08/02/00 (2)
 
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