I wrote all the words on tissue paper as per the color of the sketch pens as shown in this pic. I started dropping 4-5 drops on each color name and it started spreading. When you are introducing colors to your child it's not that u introduced them that this is a yellow color, this is red in color and it's done. Think of various ways where the color introduction is done in play way method.
Who's is wearing which color clothes at home.
Colors of your toys.
What all colors u can find in your living room.
Colors of cloth clips.
Games like color sorting and color finder (through blocks).
You can also tell them to bring all green color things in one place from your house. (Can be done with all colors)
Explain to them the importance of colors in our life.
Take them to a garden or places where they can find more colors.