Stability of HP Printer Ink ?

good questions all. Ive never looked at "bucket chemistry" of printer inks or MSDS's.

Ive gone over to more thermal inks like IRIS process. Its much longer lived after deposition. (Although, even art prints are not color fast anymore.)

It's not just the ink. The printer head clogs up after months of not being used. I have had several ink jet printers fail like this. They are piled up in my room till I figure out a way to get them cleared up and working again. I am using my laser toner type printer now for reliability even though it is B&W.

head cleaner is ammonia and alcohol . (Thats whats in the "head cleaner"fluid they sell at Staples

I ordered new ink today. If the new batch doesn't work, I'll clean the head.

Thanks for all the valuable info...