Hi
I've bought just alittle bottle of concentrate coloring mixture and try it with:
-Acrylics aqua : OK
-solvant base : OK
-Epoxy: OK
This product coast only 4 euros( 5$) , With a little bottle , you can get the first opaque color if you mix it with 0.5 litres white paint. You can get the light color if you mix it with 10 litres white paint
I've tryed also to wix it with transparent base , and you get a very ggod transparent brown colour . You can also thin it directly with sovant thinner and you get a transparent solvant color , like a base Very thinned.
Just with a little botle , you can get many different kind of paints, depending of the thinner you use !!!!!

And you get a very big quantity of paint, opaque or transparent.
You can also mix the concentrates between them and create your own colors.
For exemple , i've mixed 10ml of 2k thinner , with 5 drop of the concentrate , then i get a perfect transparent brown colour easy to spray in 0.15 AB, witha very low pressure.
When i see how much is a auto-air transparent colour of 120 g, arround 12 euros in france . 1 kilo of transparent base water is around 30 euros , approximatively the same price as 8 auto-air bottle.It sound quite good to save money.
Try it
pat