Which primary colour is suitable as the main colour of a blue kite?

Correct answer: Blue

Blue is the correct main colour for a blue kite because it matches the kite’s stated visible colour. In traditional paint-based colour theory, blue is a primary colour. Yellow and red are also primary colours, but neither represents the kite as described. Orange is a secondary colour formed by mixing red and yellow, so it is not the best answer to a question asking for the suitable primary colour. Other blue shades could be added for pattern or shading.