Epson ink (Broughton CH4)

I've one complete set of ink cartridges for an Epson P50 photo printer and 5 individual cartridges (yellowmissing). A friend gave me the printer, but the jets are blocked and I've discarded it. Some of the cartridges were opened to try to test the printer and some were in the printer when I got it. Consequently, it is possible that some of the cartridges could be empty or dry, but at least 5 should be good.