They have incredible tinting strength and opacity. The shade most associated with yellow ochre. A soft very slightly greenish yellow. Against darker colors it is almost brilliant. Mars Yellow Deep Warm, slightly reddish.
Top tone is a bit like raw sienna but denser and brighter.
A bright very, very light red. It is almost pinkish against darker colors. The most intensely red of the mars colors. In a high key painting it appears almost brown. Surrounded by low key colors it can be strikingly saturated but never electric.