How do you make the color dark royal blue?

- Cobalt blue

- Ultramarine blue

- A touch of black

You can adjust the proportions of each color to achieve the desired shade of dark royal blue. For a deeper, more intense blue, add more cobalt blue and ultramarine blue. For a lighter, brighter blue, add more white.

Here are the step-by-step instructions:

1. Start with a base of cobalt blue.

2. Add ultramarine blue to deepen the color.

3. Add a touch of black to darken the blue.

4. Mix the colors thoroughly until you achieve the desired shade of dark royal blue.

Note: You can also create dark royal blue by mixing equal parts of cyan, magenta, and black. However, this method may not produce as rich or vibrant a blue as the method described above.