Both Transparent Venetian Red and Permanent Maroon work well with Venetian red to depict deep earthy reds moving in and out of light and shadow. In the old master way of doing things shadows were always dark and transparent while lights were opaque and the mid tone transition into the dark was often a scumbled mixing of the two using the texture of the canvas to produce the transitional color. Scumbling is where a wet color (usually lighter) is dragged back over a dry area and the area where the brush runs out of paint and the underneath color shows through the upper layer is called scumbling. Scumble works best where there is a definite texture to catch the paint being applied over the background. For an example of how this works we can imagine a small canvas which is depicting the folds in a piece of fabric with a strong side light. The entire area is painted using Transparent Venetian Red to which a small portion of Venetian Red is added in order to ensure the colors are knitted together but not so much as to significantly reduce transparency nor darkness. This layer of paint is allowed to dry. Now use Venetian Red to create the mid tone which gets scumbled back into the darker area and Use Ash Pink to lighten the Venetian Red to get the lightest tones. This description specifies Venetian Red but works just as well when using Transparent Venetian Red or other transparent dark underneath other colors too.
Chemical Description: Benzimidazolone
Pigment Number: PBr25
Lightfastness Rating: ASTM I
Pigment Opacity: Transparent
Paint Opacity: Transparent