It is along tome since I had to spot a print - I think I am just lucky. There again I use resin coated paper up to 12x16. A previous reply suggested trying Schminke Diaphoto Dyes. I have used Schminke dyes in the distant past, at least as far back as the mid 90's
but I now cannot find sauce of supply in UK. The drawback was they did however have a to fade over time. What I do now for B&W is to use a the remaining contents of a set of cartridges that came out of my Canon Pro 300 printer when I changed the cartridges over. They will eventually dry up but the pigments when dry are slightly water soluble and more importantly being a pigment and not a dye, they do not fade.
Years ago I tried using a pen to spot the offending area but for light grey shades it was just too obvious so I reverted to a grade '000' Camel Hair brush which cost me the proverbial arm and a leg, but that was 30 odd years ago, so it owes me nothing. Another benefit of using the spent cartridge residue is Canon inks are not glossy - but not matt either - somewhere in between. And if done properly they are difficult to detect.
Print spotting is a dieing art and the tint application needs a fine almost dry brush with the colour or shade applied little and often. One hint I was given was to use distilled water to which was added a drop - no more - of Kodak wetting agent I always used the Kodak one but I suppose any other manufacturer's product will work just as well. Don't ever use domestic liquid detergent because it contains an incredible proportion of salt and over time this can damage a monochrome print.
but I now cannot find sauce of supply in UK. The drawback was they did however have a to fade over time. What I do now for B&W is to use a the remaining contents of a set of cartridges that came out of my Canon Pro 300 printer when I changed the cartridges over. They will eventually dry up but the pigments when dry are slightly water soluble and more importantly being a pigment and not a dye, they do not fade.
Years ago I tried using a pen to spot the offending area but for light grey shades it was just too obvious so I reverted to a grade '000' Camel Hair brush which cost me the proverbial arm and a leg, but that was 30 odd years ago, so it owes me nothing. Another benefit of using the spent cartridge residue is Canon inks are not glossy - but not matt either - somewhere in between. And if done properly they are difficult to detect.
Print spotting is a dieing art and the tint application needs a fine almost dry brush with the colour or shade applied little and often. One hint I was given was to use distilled water to which was added a drop - no more - of Kodak wetting agent I always used the Kodak one but I suppose any other manufacturer's product will work just as well. Don't ever use domestic liquid detergent because it contains an incredible proportion of salt and over time this can damage a monochrome print.