Isaac Jacobs Portrait

Isaac Jacobs Portrait

Isaac Jacob

Since its introduction in the eighteenth century ‘Bristol Blue’ has been the most distinctive and recognisable of all English glass. The colour is derived from cobalt oxide, originally imported into Bristol from Saxony, for the pottery trade. The Bristol merchant, Richard Champion and the chemist William Cookworthy were thought to have had the idea of using the cobalt to create the soft but intense colour. This is probably a myth, because the use of cobalt as a colouring for glass had been known to glassmakers for centuries, but the process rapidly became enormously popular in the eighteenth century. Because the cobalt was only imported through Bristol, and in the hands of Cookworthy, who made no restrictions who could purchase his stock, the name ‘Bristol Blue’ could have arisen from the place where the colouring agent was purchased. ‘Bristol Blue’ glass was made all over the country, and continues to be so, so that it is not correct to think of the name as being restricted only to glass made in Bristol.