Photographers' Formulary Metol (Elon) - 1 Lb. Tweet Description Metol(Elon) Developing Agent is used as a developing agent, usually with hydroquinone, but sometimes by itself as in Kodak D-23. Details Additional Category Tags: Chemistry, Alternative Process & Miscellaneous Chemistry Category: Photography Manufacturer Catalog Number: 10-0770 1LB Product Manufacturer: Photographers' Formulary Subcategory: Darkroom Equipment