'The "Azo" (aye - zoe) is short for Azomethine, Nickel Azo pigment produces a transparent, brownish yellow at full strength but with enormous range. Excellent for creating rich amber glazes or extending further for high-pitched yellows. Tint with white for a bright, sunshine yellow. (Series6) 

Lightfastness: I, Permanency: Excellent, Opacity/Transparency: 7 Transparent 

Pigment: Nickel Complex Azo, PY150, 12764