You can use any red, yellow and blue to do this task. In fact it is fun to try a few and get different results.
I am just finishing up a class a took where I made larger paintings out of several smaller subjects you can see them in my large paintings page on my website. I plan to do more of these. It is a design challenge I enjoy.
I am a watercolor artist, coach and author. You can contact me for lessons on and off line here.
My book Three Step Watercolors can be purchased by clicking here
Prints and other products are available here
Video of the Three Step watercolor process can be seen here
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