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Almost any heavy metal can be used as a toner in Photography, ... that being said, at one point or another iridium was used as a toner, producing a yellow image (much lighter than sepia) But since iridium is radioactive (only mildly- you would have to eat it or cover your skin with it to absorb more radiation than a day in the sun) there is no reason to use it except for the learning experience

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16y ago
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9y ago

Iodine is used because it is sensitive to light. This means that film that contains iodine can be easily developed.

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Q: Why is iodine used in photography?
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