What keeps pigment ink on paper

Started Jul 21, 2019 | Discussions thread
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Alexey Senior Member • Posts: 1,205
What keeps pigment ink on paper

i understand that with dye ink, the dissolved color particles are so small that they travel deep into and under the coating of photopaper.  But what keep pigment ink on paper?  What prevents it from falling off the surface once dry, especially with matte papers?  Does some amount actually fall/rub off with time as photos are handled?  Or does pigment somehow become one with paper?

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