Coyotebreaks said:
I have previsouly tried using the oposing colour in the wheel to try to darken a colour, didn't think to try to lower saturation that way, will this at some to. Trouble is with some pre-mixed colours its hard to know what to use as the opposite colour, when I can find one though its cool.
Yep that's one of the key things if you're relying on mixing complements, using any paints actually. Other than the problem of being able to identify what the original hue of any colour is, so you're sure what its opposite is, opposing hue doesn't guarantee two paints will work as mixing complements as I mention above.
But unless your colour requirements are very precise it is okay if you're using something that's not quite perfect - artists do this literally all the time - and if you get any unwanted colour shifts in the mixture they are easily compensated for.
One thing I would add about using greys to neutralise, I can guarantee that it works really well but it can be hard to control so if you run into trouble don't think the method is at fault, this is one of those things you have to work at.
Also, have to be careful about using them with yellows and oranges, as you can tend to get dull greens (even if you were using true neutral greys this can happen). But overall greys will give the most predictable results though, requiring the least tweaking.
Einion