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Originally Posted by Jennifer Bogartz
Thank you for answering my questions. Why is it best to avoid organic varnishes like the one made out of egg white and salt?
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Because that is not a strong varnish, yellows faster than the others and can be really messy to apply. The good thing is that it is non toxic, but if you go outdoors you won't have problems using retouch varnish. The final varnish can be used in your studio (if you are using brushes).
A good example of the quality of current varnishes is the one used on Rembrandt's Night Watch. A crazy guy threw acid on the painting (and that was the second time the painting was attacked), immediately after that a security guard started removing the acid with destilated water and fortunately the acid didn't reach the painting, it only scratched the varnish surface (of course there were thick coats of varnish). The results woundn't be the same if that happened to egg varnish.