Lifted from the Battlefront (Flames of War) Forum.
Here is the recipe:

Buy a bottle of "FUTURE acrylic floor finish for non-wax and regular floors" by Johnson & Son. In the U.S. it comes in big 27 ounce clear plastic squeeze bottles for about $7, and was available in both supermarkets I checked. This is more than I can probably use in a lifetime. The clear liquid inside is slightly more viscous than water.

Pre-mix some of the FUTURE, one part of acrylic finish to four parts of water. This is the Magic Wash stock. I made mine up in a liter sealable bottle. Making a clear stock up ahead of time allows the small bubbles which can result when mixed with water to subside over time.

Devote one brush to be the Magic Wash brush. I don't know if this is really necessary, but it seems safer to me, since the formula of the FUTURE finish is different from those of our acrylic paints.

When you are ready to use it, mix a little of the Magic Wash stock with a small amount of your chosen pigment. Stir it with your brush, don't shake it, that creates bubbles. I have successfully used inks and acrylic paints as pigments.

Brush over your figures and allow to dry. It dries just about as quickly as acrylic paints.

It sucks the pigment right down into the crevasses and keeps it there. Doesn't let it "osmosis" back up. And the high areas remain remarkably clear ! I have used black, dark brown, and light tan (for white marble).

And Magic Wash even gives a hard protective coating !! It's not too shiny, but a final coat of dullcote often makes the figures look better to my eye.

What DON'T I like about it? Well, I've mentioned the little bubbles, with a method for avoiding them. The only other "problem" is that, if you tend to lick your brush while painting, the stuff tastes TERRIBLE !! So I have given up that habit when using Magic Wash.

Future is available only in the United States. However it is sold under other names, or there are similar products, available in other countries.

> United Kingdom: Klear or Krystal Klear

If anyone wants a dollop of Klear, I have a bottle full!

Or you could just use army painter.... its ace...

_________________
The Original Hyperactive Peep

That's Dip not Wash!
Alright if you just want varying depths of brown.