Response to reducer for retouching black marks on prints

I've had some sucess using an Iodine solution called "LUGOL". I don't know exactly what it contains, but I think it's mostly harmless. It bleaches out the image, leaving a yellow stain that must disapear if you pass the print through the fixer again. Then you spot the white dots with a retouching ink. You can also use Farmer's reducer, which contains potassium ferricyanide. Don't drink it. The effect is slow and you shall have to be patient in order to eliminate black spots comletely.

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