This is the description of the Ultra EXTREME:
Ultra Extreme is our product of choice for international shipping,
half of the weight of conventional airbrush colors because of it's
super concentrate formula .
The color is formulated as a super concentrate that is designed for
adding equal parts of distilled water making a color much like the
Ultra Series. Power users can use the Ultra Extreme right out of the
bottle for Extreme airbrushing and producing super saturated colors
and beautiful graduations. Heat set at 325 degrees F. for washing
machine durability. Air pressure requirements as low as 15 psi for
good atomization.
Please note that Ultra Extreme is concentrated to yield double the
amount of paint ordered, a 2oz. is like getting a 4 oz. bottle of
Ultra and a 4 oz is like an 8 oz. bottle of Ultra.
However If you want to try being a Power User you can spray the Ultra
EXTREME as it comes out of the bottle, this will provide you the
ability to obtain more color saturation and faster painting speeds,
be prepared for some fast responsive airbrushing power the Ultra
EXTREME carries a lot of Color Power.