Which is the most suitable sequence when creating secondary colours from primary colours?

Correct answer: Gradually mix two selected primary colours on a clean palette

To create a secondary colour cleanly, select the required pair of primary pigments, place them on a clean palette, and mix them gradually while observing the result. Option C is correct because this process controls both colour and proportion. Mixing all three can produce a dull muddy mixture, an unclean brush contaminates the colour, and adding black first changes value rather than producing a pure secondary colour.