It is difficult to see clearly in a photo, but if you look carefully, you can see shapes which lie under the top layer of paper, appear in the first pic, which dont appear in the second.
I am interested in what happens when interference colour is overprinted with inkjet colour. I can not directly print over the colour, as it is of course, water resistent, and the liquid ink would pool on the surface, so I embed painted paper shapes under the top layer of Abaca tissue which seems to absorb surplus ink.  The underlying shapes can be seen after the surface has been waxed although, of course, the effect is slightly diffused.