SHADING.
To look well, and to add to the beauty of your work, shading must be carefully executed in both lining and coloring.
Do not use a dark color for shading, as it will give the letter an appearance of bulkiness.
Always use a delicate tint for shade lines, such as light grey, which gives a very pretty tone to a sign. This shade can be made by mixing black, white and Prussian blue.
Shade on two sides only; the left side of your perpendicular stroke and underneath the horizontal one; or, vice versa.
Do not crowd the shade lines into your letter. Leave a space between them about the thickness of the line in the letter itself.