The medium had many limitations as you could only paint with it area by small area . It was difficult to apply to large areas however fresco paintings were common.
Jan van Eyck Painted with tempera and oils , which gave a very different effect. Turner and Rembrant used raw pigments with oil base.
Martin described the reflective qualities of using a glaze, how the gesso is the reflective part of the painting. A transparent layer of coloured glaze becomes luminous because of what is beneath it.
A Grissille is a tonal black and white under painting that has colour by the addition of glaze .
Rembrandt added 'gesso force' extra white layers and optical mixes, primary grazes layered on top of each other to create secondary colours. The sequence makes a great difference. Many thin layers were added.
Stage one of today's studie painting .
A cadmium yellow light substrate was the starting point. Then earth coloured pigments were
layer on top using an E'bouche tempra technique using a special medium . Lots of raging off to make varied texture.
Second stage of painting
Noticed the forced white pigment tempera on the skyline.
Third stage glazing with transparent red and a Resin medium make shout glaze mix is not slide ( keep a really dry brush watch out no spirit anywhere near because it will take the paint off)
Fourth stage 
Grazing with Indian Yellow and raging off in places
Fifth stage
Final painting with oil paint applied to house and foreground grasses. ( no spirit to be mixed with the oil paint )
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