From left to right I tried
1. Brown ink diluted with water.
2. "Klear" floor polish with brown ink added.
3. A 50/50 mix of "Klear" and water with brown ink.
4. A 25% "Klear" and 75% water mix with brwn ink.
5. Brown acrylic paint diluted with water.
For me the results were very interestig. I had been led to believe that the 25%/75% would give the best results, but for me, and I think the pics show it the best results were using 100%"Klear". Klear seems to induce a capilliary action, drawing the pigment into the recesses quite nicely. I could see this happenning as I was putting the wash on with 2, 3 and 4. Interestingly, when the washes were being applied, the paint mix looked really goog, but as it dried, the effect looked very messy.
With all of the washes, there was some tainting of the original white colour, but more so with the ink and paint mixes. I think I will do some more experiments with different pigments, and maybe even try some of the specifically manufactured washes. I will report back - watch this space!