Quite often I test out the paints in different ways, sometimes creating art like when I got new paints from Kama Pigments, or like in this example which resembles the 'colour chickens' I read about in an art book. More like colour boomerangs! I am looking at the central portion where the two colours mix to see what they do, the hue, and the consistency. Some combinations turn out grey and dull, others sharp and bright. Here, I saw how great the bismuth vanadate yellow made bright green (chartreuse) in the top right.
This one was to see how the bright reds and yellows could make orange. In each case the orange was slightly dull compared to using actual orange paint. When two paints loose chroma after mixing it is called saturation cost. It is not bad necessarily, most landscapes have slightly dull colours compared to abstracts generally.
If I am having trouble getting a colour correct, I may go back to the drawing board and try out a few mixes. These were done to make the Hiroshige copy even better. The reds were for the pagoda, the greys for the roof, and the blues for the sky.
Before I go out landscape painting, occasionally I test out a few things at home to see how they work. Seen above, I was trying out the new blue paints I had, with little test marks, and an imaginary scene. The french ultramarine worked well with some mixed phthalo. I added the 'paint test' tag to other examples. The blog is kind of a reference book for me, I can go back and look at discoveries. Just making the scans today I found one of an amazing toffee-brown made by mixing perylene green (Pbk31) and perylene maroon (PR179). I didn't scan it, but will make a nicer painting using the combo.
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