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Minh,
You will find that the Mars colours are the cleanest of the earth range. For Cadmium Yellows, I shifted to Permanent Lemon Yellow (Rembrandt], it's a bright lemon yellow. Makes good greens with just about anything.
Burnt Sienna is not Transparent Red Oxide. It is Sienna that has been heated. Transparent Red Oxide is a man-altered iron oxide; it may be just a mix of Blanc Fixe or Alumina Hydrate with a Mars colour.
I was always taught that it is better to mix any Umber (yellow,blue,red as you wish); the Manganese Dioxide in the Umber is a pronounced drier, but without the positive traits of Lead White.
What you maybe searching for is very clean colours.
If you can find it, Irgazine Red is a cleaner red than Cadmium Red. It is expensive. I use Irgazine Scarlet, but that has to be hand-mulled.
Peggy,
I have never used pure Titanium Dioxide White. It must be an experience.
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Khaimraj
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