The best combination for a BRIGHTER GREEN is to use a YELLOW and BLUE which have a tinge/lean or bias towards green. How you find this out is by squeezing out a blob of the following paints and checking which colour they lean more towards. For example: –
- Cadmium Yellow Light (or Lemon) – more yellowy green in colour
- Cadmium Yellow Medium – more red/orange in colour
- Cadmium Yellow Deep – more redorange in colour
- Ultramarine Blue – more violet/red in colour
- Cerulean Blue – more green/blue in colour
- Cobalt Blue – blue colour
- Manganese Blue – more green/blue in colour
Now, combine/mix the various yellows with the blues as follows: –
- If we take Cerulean or Manganese Blue and Cadmium Yellow Lemon which both lean towards Green then when we mix them both together the yellow and blue parts of the colours are cancelled out by each other, and we are left with a bright green as shown below:
- If we take French Ultramarine Blue which leans towards Violet and has more Violet than Green when compared to the Manganese Blue (above) and we add this to Cadmium Yellow Medium which contains more Orange than Green unlike the Cadmium Lemon Yellow (above) you are left with a duller more olive green. This is because there is very little of the green bias in either the French Ultramarine Blue or the Cadmium Yellow Medium.
So, that’s the trick, you look at the colour bias to see which way the colour leans.
To, darken your greens add various shades of RED (the complement to Green), or yellow ochre, deep violets or umbers. To lighten, add hansa yellow, cadmium lemon and/or white.