paint and toxicity

[Fretful_Porpentine]

A friend of mine asked me to post this:

I’m trying to figure out if my tube of Daniel Smith burnt umber watercolor paint is toxic or not. It’s giving off an unpalatable odor that I have not smelled before from other artist-grade burnt umbers I’ve used. On dickblick.com, it says that it’s chemical composition is:

Fe2O3,MnO2 or Fe2O3 + MnO2 + nH2O + Si + Al2O3 ������

This is absolute Greek to me. It also says “iron oxides with manganese silicates or dioxides.” But, here’s the clincher, under "Toxicity: Burnt Umber itself is considered non-toxic. If contaminated by manganese compounds, it may be highly toxic if inhaled and moderately toxic if ingested."������������

������So, is my tube of burnt umber paint toxic or not? Is MnO2 a manganese dioxide? Does manganese dioxide cause an odor under certain conditions like being exposed to heat from being outside in the sun?

What is causing my Daniel Smith burnt umber watercolor paint to stink, and is the odor toxic?