I finally resolved (or may have resolved ...) my problem. I used with perseverance (for about one month) a solvent for printer ink (injecting a few drops of solvent using a syringe, drying the remaining dirty liquid after a few hours). Obviously this is a sperimental method used as a last resort. Probably (in my opinion) there is a tendency to clog up of printer nozzle, but why only for black ink ? .....
↧