Rudstone, natural iron-clay ochre (PR 101)
Found in among coal measures, North Yorkshire. Iron rich clay, compressed by water action into hard cakes. Formerly used for sheep marking (rudstone, ruddle, reddle, etc). Ground to a fine powder, with gentle granulation as a wash. Semi-transparent.
Brilliant Yellow (PW 6, PY 53)
This is a special grade of Nickel Titanium Yellow pigment, blended with best quality Titanium dioxide to create this off-white shade. Ideal for highlights, where white alone is too invasive. Opaque as mass tone, some transparency as a wash. Permanent.
Lemon Yellow (Nickel Titanate) (PY53)
Modern, opaque metal mineral pigment. Very good hiding power.
Horton Lemon (PY3)
Synthetic organic pigment, very intense – cool lemon shade. Transparent when diluted to a wash.
Cadmium Lemon Yellow (PY35)
Opaque, intense, dense. Slightly transparent when compared to Cadmium Yellow.