First presented as a pigment in London in November 1935, Phthalo Blue was claimed to be the most important discovery of blue shades since Prussian Blue and Artificial Ultramarine. It...
First presented as a pigment in London in November 1935, Phthalo Blue was claimed to be the most important discovery of blue shades since Prussian Blue and Artificial Ultramarine. It is even considered by some as a superior pigment to both.
