Originally Posted by ArtistWithaView
Remember Donald is not against anything. He is not a painter. He just discovered the written formula and description of its use by the Flemish masters of the 15th century. If you use turpentine then the subtle effects that you are able to get with the formula are lost. The formula allows you to paint several layers wet into wet without disturbing the layer already painted, giving that luminous effect seen in paintings from that time period. Turpentine being a solvent attacks the paint and layers ruining the effect.
I understand what you're getting at, but I am puzzled as to how Blockx (the oldest manufacturer of amber varnish) could be doing something wrong.
Maybe Donald is working off a different recipe?
Overall so far if anyone were to ask me which one I'd recommend I'd say, Groves. But I have yet to use the Blockx varnish in practice, I've just done a test swatch with it compared to Groves. and I have nothing to go by on Alchemist amber but what you've been telling me.
I would recommend Groves to people because it is the most cost friendly, and the Groves website is loaded with info and other historical mediums.