Quote Originally Posted by holmburgers View Post
I don't wish to derail the thread by any means, but this talk of fumed silica has been very interesting and has started me wondering if it might be useful for something else; namely dye-imbibition.

Because fumed silica is used in micro-porous inkjet papers to accept pigment inks (which I realize are fundamentally different than dyes), I wonder if the same high surface area property that makes it suitable for this might act as a sponge/trap for dye solutions; thus reducing diffusion in non-mordanted receiving papers.

Just a thought... wanted to mention it. It's exciting to apply new materials to old processes.
At the risk of wandering too far down the digital road...some inkjet printers are dye-based (including some relatively high-end ones), and there is some evidence that dye migration is an issue, albeit significantly reduced from the days of swellable polymer papers. But from my understanding, this is something that tends to happen over longer periods of time (weeks to months). Google is your friend on this...

But if a dye-imbibition print could be made relatively quickly, before the dyes had a chance to migrate appreciably, then perhaps a mordanting bath after the print was complete might arrest the migration? The biggest issue might be the matrix getting bonded to the substrate during transfer. After all, some people use micro-porous inkjet papers as the final support for carbon transfers.

Just some more (now fairly off-topic) thoughts...

--Greg