3eBK is only used when you select plain paper. 3eBK usage varies according
to whether grayscale or colour documents are printed. If you select
grayscale 3eBK is the only ink used however in colour documents 3eBK is
only used in areas of pure black. Any paper setting other than plain paper
uses the smaller 6BK ink tank. I know because on my IP4000 3eBK ink when
dry smears easily on touch and the only time this smearing stops is when
the 6BK ink is used. I confirmed this by doing a nozzle check. Anyone
else getting this smearing on plain inkjet paper, i've tried two different
types from staples, when using 3eBK ink and plain paper setting? If it
doesn't and you're from the UK tell me which paper you're using and where
you got it, cheers!
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