A three year old should know their primary colours; red, blue and yellow. They should also be able to identify and name a few secondary colours; orange, green and purple. By this age, they should have a basic understanding of how to mix colours to create new ones.
For example, they should know that mixing blue and yellow makes green. It is also beneficial for them to be familiar with common colour words; such as white, black, brown and pink.
There are a few key colours that every three year old should know. These colours include: red, yellow, blue, and green. Each of these colours is important for different reasons.
For example, red is the colour of fire and blood, so it is associated with danger and excitement. Yellow is the colour of the sun, so it is associated with happiness and energy. Blue is the colour of the sky, so it is associated with peace and calm.
Green is the colour of nature, so it is associated with growth and life.
-What are the colors of the rainbow
There are seven colors in a rainbow: red, orange, yellow, green, blue, indigo, and violet. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength.
ROYGBIV (red, orange, yellow, green, blue, indigo, violet) is the order of the colors in a rainbow.
3 Years Old Knows All Her Colours *Must Watch*/Shantell TT
According to the blog post, a 3 year old should know the following colours: red, blue, yellow, green, orange, purple, pink, brown, and black.