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umber
The painter wanted an earth colored scene so he used raw umber as his pigment.
A negative times a negative equals a positive A negative times a positive equals a negative A positive times a positive equals a positive
Umber is a pigment and its color is darker than ocher. It is also, in raw form, dark yellowish-brown. In burnt form, umber is dark brown. Depending on the situation, the pigment changes color.
It is a rule in math!