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Message: [QUOTE="KenwoodTS830, post: 215800, member: 14158"] Hi All. Just discovered the forum. Please pardon if this has been asked before. Didn't find the answer in a search. Just bought a new bottle of Epson 512 black ink only to find it's supposed to be exclusively for Ecotank models ET-7700 or ET7750. My printer is an ET3600. Guess I'll return the ink for proper type. Are there different formulas of ink for Epsons Ecotank models or is it a function of the type bottle the ink is packaged in. Would I have screwed up my ink jets on the ET3600 if I had used the 512 ink? I'm told by EPson that I need T664 ink for the ET3600. Thanks Roger [/QUOTE]