Things You'll Need
Disposable containers with airtight lids.
Wood craft sticks
White poster board
It's time consuming to come up with the shade of red by adding only 1/4 tsp. at a time, but you'll be able to recreate the color in larger batches using the 1:24 or 1:16 or whatever the final ratio is. For example if you need have a gallon of paint, that's 16 cups, add 1 cup of black paint if the ratio is 1:16 or half a cup if the ratio was 1:32.
Don't add too much black paint at once.
Red is one of the primary colors, which means it cannot be made from any other color. Green, for example, is a combination of yellow and blue, the other two primary colors. Spectral red, the color found in the rainbow is a pure red. Shades of red are developed by mixing in other colors, white and black. If you would like to darken the color of red paint, it's a simple but tricky process. Tricky because you're creating a color that might be difficult to reproduce. Simple because you're adding only one color to the red.
Measure 4 tbsp. of the red paint into a disposable container. Add 1/4 tsp. of black paint and stir well with the craft stick. Paint the darker red paint on poster board. Close the container. Let it dry because most paints dry a darker color. Mark next to the paint that it was 1 to 48 or one part black paint to 48 parts red paint. One tablespoon equals three teaspoons. One teaspoon equals four quarter-teaspoons. So four tablespoons equals 48 quarter-teaspoons.
Measure another 4 tbsp. of red paint into another container. Add 1/2 tsp. of black paint and stir well. Paint the poster board. Mark next to that it was 1 to 24.
Continue adding more black paint by 1/4 tsp. to 4 tbsp. of red paint until you reach the color you want. Different surfaces will show colors differently. Paint a small swatch of the final red color on the surface that will be painted. Let it dry. If it dries to the color you want, you're finished. If it's too light, go back and make another batch but add only an additional 1/8 tsp. of black paint. If it's too dark, use the last formula you used but subtract 1/8 tsp. of black paint. In other words if you used 3/4 tsp. — 6/8 tsp. — of black paint to 4 tbsp. of red, use 5/8 tsp. of black paint.
Katie Jensen's first book was published in 2000. Since then she has written additional books as well as screenplays, website content and e-books. Rosehill holds a Master of Business Administration from Arizona State University. Her articles specialize in business and personal finance. Her passion includes cooking, eating and writing about food.