The cover from the January 1936 issue of "Advertising Display & Press Publicity" magazine published by Buisness Publications Ltd. of London. The issue has an article on the introduction of the newly developed 'Monastral Blue' pigment developed and produced by the then giant ICI company - Imperical Chemical Industries. The company had been formed in 1926 by way of a merger of four of the UK's major chemical companies to attempt to stave off foreign competition that was seen to be aided by fragmentation in the UK industry. Monastral Blue was a major development in blue pigments being more 'fast' and stable. I recall the colour as it was used to describe the almost black colour used on the livery of Birmingham City Transport's buses; there must have been a lot of Monastral Blue in that shade to get it so deep.
Monastral Blue was used as a colour in printing ink and indeed as the advert shows the Mona Blue colour produced by ink manufacturer's Lorrilleux & Bolton Ltd. was used as the highlight colour throughout this issue of the magazine including the cover, by G R Morris, and L&B's own advert by Bernard Venables.