As I read through the posts I wondered if anyone had mentioned Neo Megilp, and so was happy to see Richard's post. Megilp was invented in the late 18th century to make oil paintings more lustrous, and was used for many many years before it was discovered that the lead and mastic in it was turning paintings dark and yellow. Gamblin has developed Neo Megilp (which has a consistency of vaseline) with modern ingredients that presumably won't have the same disastrous results. I've started using it recently, and so far like it a lot.
John C.
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