diamond: [Digital BW] K7 gloss was Re: 1800-3MK+Glop+PK

> The R1800 cartridges bought from IJM are never more than 2 months
old.
> We do all filling of small format cartridges in-house. SO there is
no
> way to purchase carts with pigment settling. You just got yours
> recently. However, there is a possibility of contamination of one
> shade of ink with another when refilling.
>
> You SHOULD use one syringe for one shade and never mix a syringe
used
> for one shade with another. One drop of a darker shade of ink will
> affect a lighter shade. It is that sensitive and that precise. So
you
> should have 7 syringes with 7 needles very clearly marked.
>
> It is better to put the safety cap back on the syringe and letting
the
> remaining ink stay in the syringe, than trying to wash out a
syringe.
> If you do go the washing out method - you really need to dry
> completely and thoroughly before using it again so the drops of
water
> do not dilute the ink either.
>
> The obvious of course, is not to put the wrong shade in the
cartridge.
> Otherwise, you should not be experiencing density changes as you
> describe through normal use.

Jon, I sourced 8 new brand MIS cartridges, needles, etc... everything
is double labelled (K shade and Oem color name). Mishandling
probability is nil. Besides, it takes me a full hour to fill up the 8
cartridges one at a time with all the checking and max care.

At second thought, I have a feeling that the density variation takes
place because of contamination inside the printer at the heads level
maybe when the heads go to the pads where there's a *LOT* of wet ink.
It's the same situation as color contamination when BW inks get
loaded for the first time. I'll print some more sheets and check
readings. I see no other explanation right now.

Olivier

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