I have 4 little bottles of the Tsukinko inks and bought 1 set of the Fantastix, which means that I still need to buy more brushes as there are two tip shapes of brushes. The brushes that I bought were three of each shaped tip. The info out there, even on Jukebox Quilts, is very lacking for those just starting out but playing with them is the best thing to learn from.
The white is more opaque than the colors, from my experience. The colors are wonderfully translucent and beautiful. You can mix them with clear aloe gel (I got the kind without color) and the recipe that I found to try was 3 TBSP of gel to 9 drops of ink. I only used 1 TBSP of gel to the 9 drops and it worked fine. Mixing with the gel lightens the colors, so you add more drops if you want it darker, fewer if you want it lighter. When you paint with it (I used burgundy) on a lighter color, it gave the appearance of watercolor, and you must be mindful of the gel sitting on the surface as well as brush strokes. When I put it on the dark, it just sort of soaked in and didn't show UNTIL I used a layer of the white first.
Though I tried it with the gel, I ended up doing my project by dipping my Fantastix directly in the ink and then painting on my fabrics without gel at all. I like both effects, but for the piece that I was working on, using the ink without gel worked the best for me.
I am currently considering getting the acrylic stand, some more brushes and a few more colors of the ink, as I know that I will use them in future projects. I mixed my gel and ink in one of those plastic tubs with lids that you get a brand of sandwich meat in and used another of those tubs to store my Fantastix, droppers, etc. Then I put both tubs in a gallon sized zipper bag to keep them from drying out too quickly. So far it's worked great for me.
On this block, the ink was the "mists" behind the mountaintops and a light bit of white on the "lake". The sky and water were the fabric with no enhancement. The color of the "mists" appear lighter than they really are, due to the flash of the camera.