This simple worksheet is a great way to review color vocabulary in Spanish as well as some basic color theory. Students color in each circle as directed, then write the word for the resulting color when two primary colors are mixed. Basic primary colors are first, then the worksheet branches out into black, white gray and pink. Finally, tertiary colors are formed by mixing green and blue to make turquoise, plus blue and purple to make indigo or navy blue.
For a follow-up activity, have students read their "sentences" aloud to check their work. For younger students, this can be embellished from a simple review page into a full art lesson with paint mixing to test their ideas (for a neater version, use color mixing paddles like the ones at https://www.staples.com/Learning-Resources-Color-Paddle-Assorted/product_877955.