Quick view Michael Harding Oil - Manganese Violet S3 Michael Harding MSRP: £16.11 - £71.42 PV16. Average Drying. Semi-Opaque. Excellent Lightfastness. Average Oil Content. Manganese Ammonium Pyrophosphate, a heavy, bold Violet which was first made in Germany in 1868; one of the mid-19th...