Mix Salts Basic with. When light falls on these materials it starts a photochemical reaction about which you will study in higher grades. Actinoid Element Chemical Element Group Periodic Table Sms Language Periodic Table Of The Elements Click hereto get an answer to your question Name the four chemicals that are obtained from common salt and write their molecular formulae. . There are two salts that are used in the creation of the black and white photography which are Silver chloride and the silver Iodide. This is because silver salts in particular silver halides are light sensitive compounds. Photographic paper made at home. Talbot knew that silver-chloride could be used for photographic printing but it couldnt be coated onto paper. For eg- Potassium sodium tartrate KNaC 4 H 4 O 64H 2 O also known as Rochelle salt. On the other hand the silver bromide is found naturally as the mineral bromargyrite. Salt i...