Challenge: create an extreme permanent color pallette

[Gigalot]

My experimental painting after 2 years.

Palette:
Brown and black - self made pigments
Red - cobalt violet
Yellow - Naples yellow (Chinese, cadmium based)
Green - pure
Picture Varnish - Alkyd. Very durable. During drying time lost half it`s initial gloss.

Looking good after heating and sun light exposed. No visible cracks, not faded. Violet looks better after sun light exposition.

[Mythrill]

Originally Posted by Gigalot

My experimental painting after 2 years.

Palette:
Brown and black - self made pigments
Red - cobalt violet
Yellow - Naples yellow (Chinese, cadmium based)
Green - pure
Picture Varnish - Alkyd. Very durable. During drying time lost half it`s initial gloss.

Looking good after heating and sun light exposed. No visible cracks, not faded. Violet looks better after sun light exposition.

Gigalot, nice painting! The thing you said about your violet concerns me a bit though. How does it look "better"? Has it faded? I'm asking this because I've seen threads here about manufacturers that claim to sell cobalt violet but then actually adulterate it with another color.

[Mythrill]

Anyway, I was thinking, something that took me ages to figure out: bismuth yellows are a great alternative for cadmiums! However, of all dickblick acrylic paint manufacturers, only two offer colors beyond the lemon shade (professional line): Old Holland and Tri-Art. Also, I'm not sure about the other shades, but bismuth lemon seems to make duller mixes than cadmium lemon.

(Note: I'm specifically talking about acrylics.)

Edit: I searched in all oil paint lines in dickblick that were artist-grade (38!) and I couldn't find anything close to the bismuth "medium" and "deep" shades in oil paint. Norma has (Bismuth) Vanadate Deep, but it looks more like a Naples Yellow. The only good alternative to cadmium yellow shades I found there was a deep version of Nickel Titanium Yellow. But as you told me yourselves, the "light" variation is very dull, and there's no "medium" (and saturated) variation.

[Gigalot]

Personally, I use PY32 ( it looks like Hansa PY3 in hue and transparency. You can`t determine which paint is Hansa and which is Strontium. But after heating Hansa loose it`s color) as very good cadmium lemon alternative to paint greens (in theory it can change color towards green?) And also I use Cadmium yellow medium to mix pure orange and deep yellow. When I need a lot of thick yellow I can try PY74 underpainting and then Cadmium over it.
Yellow ocher is permanent thing too.

PY 32 is not available in watercolor and acrylic because it is slightly water soluble.

Cobalt Violet pigment is 100% OK, but its linseed oil, as always, darkens slightly. This tendency affects violet or blue color (or even chromium oxide!) more than iron oxides. But , sun light bleached it. Linseed oil`s yellow hue is fugitive.

Cobalt violet light is not available in acrylic - it contains ammonium and therefore it is high PH sensitive. Oil has lower PH index than an acrylic binder.