prov:value
| - These nuclei, which are sometimes also referred to as physical development nuclei, serve to accelerate reduction of silver salts, and may be constituted in substances such as sulfides, selenides or tellurides, which are difficult to dissolve in water and are formed from metals such as zinc, mercury, lead, cadmium, iron, chrome, nickel, tin, cobalt, copper, silver, or gold, heavy metals such as sil
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