Trộn màu vàng và xanh dương.

Given the above summary, write a detailed text in English for it.
Pour equal amounts of pure blue and pure yellow into a paint dish or onto a paint palette. Use a palette knife to thoroughly mix the colors together.  When mixed, the original colors should produce a pure green. To get a more accurate idea of how this green looks, use a paint brush to apply a small amount to some scrap practice paper.