e/Gum over platinum

Information
has gloss	eng: Gum over platinum is a historical chemical photographic process, which was commonly used in art photography. It is a very complex process, in which a specially-treated platinum print photograph is coated with washes of gum arabic, then re-exposed to the same photographic negative. The finished process results in a sepia toned print, and is said to impart added luminosity and depth. It is sometimes called pigment over platinum.
lexicalization	eng: Gum over platinum
instance of	(noun) a heavy precious metallic element; grey-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits Pt, atomic number 78, platinum