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Alexandrite does show metameric failure, and diffraction has nothing to do with it. (I used to teach mineralogy and optical mineralogy, and I've done lots of x-ray diffraction.) Most people call the phenomenon metamerism, but persnickety people on the web say it's supposed to be called...

No, metamerism, more properly called metameric failure ( https://en.wikipedia.org/wiki/Metamerism_(color)#Metameric_failure ) is a different phenomenon. "The term illuminant metameric failure or illuminant metamerism is sometimes used to describe situations where two material samples match when...

Sorry I didn't notice this before. The answer is maybe. I have a PRO-9000 with blue-grays that are almost the color of an eggplant when first out of the machine, but settle down later. Still, when I try to adjust the color, it's hard to get it just right so it's satisfactory in both tungsten...

It's very easy to replace Canon and HP heads, and I assume Brother heads as well--the only problems being cost and availability. Epson heads are not user-replaceable.

I've never heard of ink "going bad" in the printer. The main problem is that the head can dry up, although the only printer that ever gave me that problem was an old HP with an integrated cartridge. I prefer pigment ink for written work. I really don't want to take chances on my printed work...

I didn't look at the list, but most HP cartridges are indeed tanks with no printhead. The integrated units are generally found on the cheapest printers, but don't give you much ink for your money.

I've wondered about this too. I have one of those cheap heads for HP that I am keeping as a spare part. (I don't remember where it came from.) The packaging appears to be genuine, but I may never know until I need it.

Now that's what I call weather.

OK, you guys with the air in the CIS. I am guessing that some of the problem might come from storing ink in the refrigerator. Air is more soluble at low temperatures. When the ink warms up again, it gradually releases air. Unfortunately, the release can occur very gradually. Bummer. I...

Absolutely amazing. $60 including shipping and paper. Mine is on order, because, well, you never know when you'll run out of ink. :)

Thank you for posting that. I had looked for it but had given up. I have a post on page 3 of that thread that explains my thinking, which is somewhat different from Mikling's. I think that's closer to what happened here. A solid or viscous deposit somewhere. Purging required. A new...

I think I have some answers, and a new procedure and recommendation. To summarize, in this case the problem was not air in the sponge. (And remember, these were new but expired cartridges.) I purged with ammonia and distilled water using the Freedom method, and by gosh they sure drain now. I...

There are two other cartridges from the same batch, and they have essentially the same weight. I'm trying to drain them right now. The cartridge does drain to a certain extent. I suppose the sponge drains, but the ink chamber does not drain. (EDIT: I can hear liquid in the chamber when I...

The cartridge has not been in the printer yet. I expect the printer to complain but use the cartridge anyway. I bought this with other cartridges to have some spares. It was old enough that I planned to just drain it and refill it before the first use. The bare cartridge weighed 26.63 g new...

This is interesting. I just acquired a new HP564K XL cartridge that expired in January 2015. That's a pigment black, sponge and ink chamber type cartridge, similar to Canon cartridges. It's for an HP Photosmart C309a. It's apparently a new, genuine HP cartridge. I tried to drain it using...

Anyone? Is the deal still on anywhere? Otherwise it costs about $450, and I'm not going to pop for that just to save money.

Late to the party, just back from vacation. The deal at PROCAM seems to be over??? They show the PRO-10 out of stock on line, and there's no place to click and order.

Are you sure? I have very good water too. I think it has mostly to do with pH, but it could vary from time to time. I strongly suggest that you make a careful test. I could easily see the flocculation by mixing a couple of drops and observing with a 10x magnifier.

There's one thing I think I do not recommend: tap water. I have seen recommendations to just put a print head under running tap water, but here's the rub: tap water can cause pigment ink to flocculate. I was experimenting with cleaning fluids, and mixed a drop of black pigment ink with a...

Thanks for looking up all those discussions. I guess you're right that Canon seals them hermetically. I had forgotten that. But that doesn't mean that home users need to seal the vent for storage. If the vent had not been sealed when Turbguy opened the ink port, it wouldn't have leaked, and...