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You can add opacity to your cad reds by adding yellow ochre or gold ochre in the appropriate value. Interestingly, you can add up to 50% yellow ochre into cadmium red, and still have it read "cad red."
Unlike adding titanium white, adding yellow ochre will not change the value or temperature of the cad red. Marvin and Sharon are right, Aliz and Perm Rose are both transparent. Stick with at least the semi-opaque reds, like the cads.
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