This color is richer, deeper, more translucent and ever so slightly more purple than our regular Cobalt Blue. Like willow-ware china. Originating from the Williamsburg neighborhood of Brooklyn, over one hundred seventy artist quality oil colors are now made in New Berlin, NY. Each color is milled in small batches to provide a unique expression of each pigment used. For that reason, our paints are not homogeneous, as some colors require a very fine grind that results in a rich, smooth paint, while others are best allowed to retain more texture and provide a little more resistance and less gloss. Technical Detail Lightfastness rating Opacity / Transparency Semi-Opaque Drying Time Fast (1-2 days) Grind Very Fine Pigment Detail PB28 CI number:77346 Common name:Cobalt Aluminate Classification:Synthetic Inorganic Chemical Description:Cobalt Aluminate