A large factory of the Tien Chu Chemical Industries (HK) Ltd was located at 72 Pak Tai Street, Ma Tau Kok/To Kwa Wan and is marked on the 1956 Kowloon map. It occupied a 200,000 ft2 site, and manufactured food additives/powders and raw chemicals, including caustic soda and hydrochloric acid.
It is also referred to as Tien Chu Ve-Tsin Chemical Industries Company.
Industrial History of HK website: https://industrialhistoryhk.org/tien-chu-company/
Hong Kong Memory website (recorded memories of Wen Choy Bon): https://www.hkmemory.hk/collections/oral_history/All_Items_OH/oha_119/r…
HKU Digital Library: https://digitalrepository.lib.hku.hk/catalog/8k71nk61t#?c=&m=&s=&cv=