Hi Robert and Bruno, I think David Griffiths mentions this rule in his book. I sometimes lighten paints for scale effect but use a very light bluegrey rather than white. In addition, you have to watch what you do trying to get a scale effect with reds, yellows, and oranges. It's quite easy to change red into pink if you don't watch what you are doing. Richard. Previous Message Hi Robert, Years ago on this very board I got a formula for scale effect which told: "add lightening color white in a percentage equal to the square root of the denominator of the scale". Given for 1:350, the denominator is 350 and its square root is 18.7 so according to this formula I should add about 1920% of white. I absolutely DON'T KNOW the origin of this formula, but it seems to work fine, except maybe for Navy Blue, for which color I tend to add up to 30% of white. For scale effects on lighter colors like white, yellow and red I add about 3 to 5% of neutral gray and I can live with this. Maybe there are other formula which work as well. But since I use this my builds no more look like toys optically. _Bruno 
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