From Ken Jones, Sydney, Australia
As a retired paint chemist, I enjoyed the article “A study in scarlet”. However, I cannot understand why the review of blue pigments excluded phthalocyanine blue, which was first marketed as Monastral Blue in 1935. Phthalocyanine blue became a major source for blue colourations in the house paint, automotive ink and plastic industries. I personally sighed with relief that we finally had a stable, non-fading blue tinter (28 February, p 41).
