I do not have any blending solution and I had read that rubbing alcohol works well as a replacement. Mine was 70%, you can also get a 90% which some people felt worked better, but they were not talking about photo glossy card which is supposed to be a "no no!".
I first tried using the rubbing alcohol by placing a few drops on the sponge (I didn't have any felt squares which are supposed to be better). After this I placed a few drops of two colours of ink and then I started dabbing it on the glossy side. It seemed to grab the ink too much so I tried the reverse side. This had a much better effect. As I had the rubbing alcohol on the sponge I started getting that lovely bubbly effect straight away.
Wording added digitally.