The double digit middle number means it's a tint,
a single digit is a shade color.
.05 is in the middle of the tint range.
The 3rd number is the warm/cool value. .5 is the middle value.
Rublev Colours by Natural Pigments first introduced Chrome Yellow Primrose as an artist oil paint in August 2010, and today, Dec 2013, introduced Chrome Yellow Light and Chrome Yellow Medium. These chrome yellows in Rublev Artists Oil Colours encapsulate the pigment so it's lightfast and resistant to acids and alkalis. Van Gogh would have used them, today his light yellows are turning brown.
The opposite color of yellow is Ultramarine Blue, a translucent pigment.
Lemon Yellow Lead Chromate, opaque, is a calcimined lead pigment. It is the very coolest Yellow and is opaque. Its modern dry chip color replacement is not opaque, translucent Hansa Arylide Yellow.
To make the darkest neutral dark color mixtures, at least one of the two colors must be transparent. As in the Cadmium Red and Thalo Cyan Blue opposition. Two opaque colors won't mix dark as with Cadmium Orange and Cobalt Blue.
To mix a neutral dark with yellow opaque is impossible.
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