Camera and Darkroom had an extensive analyis of RC paper and compared it to "Fiber -Based" (actually not true - both RC and "Fibre" can have a paper fiber "support" - a *few* RC papers are consrtucted with a plasitic - Polyethethelene? - core). Both papers have emulsions that "Lie on top of the base"... and the "base" in both cases lies on top of the support - the difference is in the polyethelene encapsulation of the "support" of RC papers...Being impervious to chemicals and water itself, washing and drying times- and curling - are drastically reduced.Originally Posted by DKT
Base materials are different - "Fiber" papers use "baryta" - a white clay: RC uses Titatnium Oxide - a pigment used widely in white paint.
Its hard to envision RC emulsions and bases "trapping" pollutants - where they "soak" into the fiber support with no PE encapsulation, it seems to me that they would hang around considerably longer and have a more pronounced effect on image degradation.