How Much Platinum Does ‘NA2’ Leave in a Palladium Print?

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‘NA2’ is the shorthand name for a contrast control agent (restrainer) that’s often used with palladium prints. Its proper name is sodium hexachloroplatinate (Na2PtCl6). As you can see from its chemical formula, it contains platinum. This leads to a reasonable and fairly common question:

“How much platinum does ‘NA2’ leave in a palladium print?”

My short answer is: somewhere between almost none and none whatsoever. read on for the long answer…


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Read more about the article Black Spots
Close-up of a black spot

Black Spots

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Mysterious black spots have plagued platinum printers from the early days of the medium. They tend to appear as small, dense spots surrounded by a corona or a sometimes comet-like…

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Workshop Report

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I’ve just finished an enjoyable couple of days teaching Javier Ternero how to make platinum/palladium prints. Javier brought some negatives originally intended for albumen printing. Albumen needs negatives about the…

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