How do you make green paint from yellow and blue?

Well because their primary colours they are needed for all others, but yellow and dark blue make a mid-Brown colour.The claim that yellow and dark blue mix to make a mid-brown color is

inexplicably and inexcusably incorrect - I've mixed a lot of paints, and yellow

mixed with blue is always green. Yellow and dark blue make aqua - the darker

the blue, the bluer will be the green obtained. If you don't have paint, try taking

children's crayons in plain blue and yellow and lightly coloring first one, then the

other. It'll magically result in green.

Brown is 50% red, and equal parts of the other two primaries. Mix red and green to get brown, not yellow and blue. Sheesh.

Here's a simple guide:

The primary colors are blue, yellow and red.

The secondary colors are:

green = blue + yellow

purple = blue + red

orange = red + yellow

The tertiary colors are:

brown = red + green

slate (gray) = blue + orange

olive = yellow + purple

A painter's or decorator's color wheel or triangle will make this all very clear.

Or buy a small artist's brush, and finger paint pots of medium red, yellow and

blue paint. Start by mixing the secondaries, then mix the primary and

secondary colors as above to convince yourself that, though some of the

results are surprising, they are in fact accurate.

Of course, how dark and how chromatically pure the mixed colors are makes

a difference to the outcome, but these are good basic rules.

Except for artists, we should seldom actually need to mix paint. Commercial

paint stores mix paint dyes according to set formulas and add them to

appropriately grey-tinted bases to get lighter or darker colors. It's very

scientific - you can replicate the color in case you run short or decide to paint

something else the same color later.

Finally, don't mix paints of different types: water-based latex, oil-based enamels, epoxy based automobile and pool paints, or paints with dyes

like ink-pen ink - you may get hazardous chemical reactions that have

nothing to do with color, or they may not mix at all, just make a messy slurry.