Rembrandt Watercolour - Half Pan - Interference Violet (847) Series 3 (RRWHP847) Renowned as a professional top quality paint, Rembrandt Artists' Watercolours offer the maximum transparency, intensity and brilliance that their name deserves - it's pure quality all the way. Interference colours will initially appear near white or colourless at first glance but when used on a dark colour or background the intensity of the colour will emerge. The colours will change when viewed at different angles. Half Pan Colour Index: Coated Mica Transparency: Semi-Opaque Lightfast:+++ Excellent Series :3 +++ = at least 100 years lightfast under museum conditions ++ = 25 - 100 years lightfast under museum conditions + = 10 - 25 years lightfast under museum conditions 0= 0 - 10 years lightfast under museum conditions The lightfastness of all these colours has been tested in accordance with ASTM Standards D4303 Most orders will be with you inside of 12 days, although some may take up to 15 working days. If you have any questions, please use the address on our contact page