And why the hell do I even care?
Glaze - This is an amazing layer for basically when you want to add a different effect or even add more contrast or change the color tone. It can make your darks darker (but not so dark that they read black - we never want that). It can make your lights, lighter (very cautiously), and your sand, pinker. It meant to add depth to your paintings. You can ad one glaze layer (of a variety of colors) or 10!
Glaze is a mixture of paint, Mineral spirits and Linseed Stand oil.
I am working on a lesson on this.
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Varnish - this is a clear protective layer and the FINAL layer.
It's clear and acts as a sacrificial layer - basically, the varnish collects the dirt and grime.
Varnish also plays an important role in that it unifies the sheen of a painting which can be all different sheens when you use glaze layers.
Then it can be removed and re-varnished and not injured the paint at all. This is how the pros do it but man, I see a MEGA TON of pros applying it WRONG on YouTube and instagram. UGH
I will demo this too.
First two pics are of Kates painting that she glazed with more pink in the sky and sand.
I'll have to edit my varnish videos. Coming soon.