E. T. Pearson and Co
of 35 Gordon Square, London, WC1. Works: Mitcham, Surrey. Telephone: Museum 8253. Cables: "Quercitan, London"
1929 Advert in British Industries Fair Catalogue as an Optical, Scientific and Photographic Exhibit. Manufacturers of Metol, free from Dimethylparaphenylenediamine, the reputed cause of Metol Dermatitis; Amidol, free from oxidation products; Paramidophenol Hydrochloride, pure and commercial. Photographic Apparatus including Post Card and Paper Holders for use when enlarging. (Scientific Section - Stand No. O.17) 
Sources of Information
- 1929 British Industries Fair Advert 124 and p133