|Shop selling Sindoor (Vermilion) in Pushkar, Rajasthan|
The purpose of the test was to find a red to use in portraits. I've added in the relevant link to the paint in the quote from the post below
For me the best of the hand-ground paints was Robert Doak’s vermilion, which I believe is either cut with cadmium if not entirely cadmium-based. That said it is extremely similar to the old Zecchi cadmium vermilion they stopped selling 8 years ago (which we all remember fondly).
You can find our more about Robert Doak specialised art materials and paints on his website - Robert Doak Colors. He also does concentrated liquid watercolors which, according to the website, are brilliant and lightfast colors.