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I used to use retouch varnish until an artist trained in Majorca showed me an alternative: A jam jar with one third oil, one third thinners and one third water, shaken vigorously and then the resulting emulsion thinly brushed in to the dry painting. This brings back the wet tone without adding another layer.
I have found it a lot easier to manage than retouching varnish. Does anyone else use this?
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