It looks to me like your printer uses a different (pigmented) black for text only pages, and a dye black for color images.
Perhaps, but I do have a lot of text in the document. It’s a workbook. That’s what’s confusing.
Thanks for weighing in.
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But you told it its using Photo Paper which is probably enough to use only the one catridge.
Pigmented inks don't usually work well on coated papers, so it's propably there for plain paper printing like a FAX
Ah, now I understand. That makes sense and is probably the issue.
Thank you Rob and Larry.