If you treat an area of a print with 5-percent ammonia solution, wash the area with distilled or tap water after treatment. Other commonly used retouching materials include colored pencils, pastels, oils, and air-brush colors. Because such a wide variety of materials is available, the effects of these materials on dye stability haven't been widely tested. However, as with lacquers, oil paints that contain peroxide-forming solvents or solvents that penetrate moist gelatin can have an adverse effect on image stability. Print-mounting materials include almost every type of solid support known.
Common examples are plastics, metals, woods, ceramics, and cloth.
A few mounting support materials are definitely inert with respect to image stability. These include clean glass and acid-free archival mounting board. Metals, textiles, woods, and plastics may or may not affect image stability. If you use mounting techniques that involve heat for adhesion, keep the temperature to a minimum and subject prints to heat for as short a time as possible to avoid altering the emulsion structure. Kodak, Kodak Professional, Ektacolor, and Estar are trademarks.