% ammonia are typically present at these operations. A concern is the inadvertent mixing of bleach or acids into an aqueous ammonia tank. Such an event could potentially occur during delivery and unloading of materials. The reaction of ammonia and bleach could result in the formation of nitrogen...
This has the effect of somewhat masking image grain and improving detail in high values. The stain can be eliminated by the addition of sulfite in the ratio of 4 or 5 to 1 of pyro. It is also possible to bleach out the silver and print by the stain alone. Once widely used, pyro ...