Grain. — The question of grain is not easy to speak about without the canvas, yet it is often a matter of importance. There are many kinds of surface, from the most smooth to the most rugged. Some grain it is well the canvas should have; too great smoothness will tend to make the painting “slick,” which is not a pleasant quality. A grain gives the canvas a “tooth,” and takes the paint better. Just what grain is best depends on the work. If you are going to have very fine detail in the picture use a smoothish canvas; but whenever you are going to paint heavily, roughly, or loosely, the rough canvas takes the paint better. The grain of the canvas takes up the paint, helps to hold it, and to disguise, in a way, the body of it. For large pictures, too, the canvas must necessarily be strong, and the mere weight of the fabric will give it a rough surface.

Knots. — For ordinary work do not be afraid of a canvas which has some irregularities and knots on it. If they are not too marked they will not be unpleasantly noticeable in the picture, and may even give a relief to too great evenness.

Twilled Canvas. — The diagonal twill which some canvases have has always been a favorite surface with painters, particularly the portrait painters. [9]

This grain is a sympathetic one to work on, takes paint well, and is not in any way objectionable in the finished picture.

The best. — The best way is to try several kinds, and when you find one which has a sympathetic working quality, and which has a good effect in the finished picture, note the quality and use it. You will find such a canvas among both the rough and smooth kinds, and so you can use either, as the character of your work suggests. It is well to have both rough and smooth ready at hand.

Absorbent. — Some canvases are primed so as to absorb the oil during the process of painting. They are very useful for some kinds of work, and many painters choose them; but unless you have some experience with the working of them, they are apt to add another source of perplexity to the difficulties of painting, so you had better not experiment with them, but use the regular nonabsorbent kinds.

Old and New. — The canvas you work on should not be too freshly primed. The painting is likely to crack if the priming is not well dried. You cannot always be sure that the canvas you get at stores is old, so you have an additional reason for getting a good stock and keeping it on hand. Then, if you have had it in your own possession a long while, you know it is not fresh. Canvas is all the better if it is a year old.

Grounds. — The color of the grounds should be [10] of interest to you. Canvases are prepared for the market usually in three colors, — a sort of cool gray, a warm light ochrish yellow, and a cool pinkish gray. Which is best is a matter of personal liking. It would be well to consider what the effect of the ground will be on the future condition of the picture when the colors begin to effect each other, as they inevitably will sooner or later.

Vibert in his “La Science de la Peinture” advocates a white ground. He says that as the color will be sure to darken somewhat with time, it is well that the ground should have as little to do with it as possible. If the ground is white there is so much the less dark pigment to influence your painting. He is right in this; but white is a most unsympathetic color to work over, and if you do not want to lay in your work with frottées, a tint is pleasanter. For most work the light ochrish ground will be found best; but you may be helped in deciding by the general tone of your picture. If the picture is to be bright and lively, use a light canvas, and if it is to be sombre, use a dark one. Remember, too, that the color of your ground will influence the appearance of every touch of paint you put on it by contrast, until the priming is covered and out of sight.

Stretchers. — The keyed stretcher, with wedges to force the corners open and so tighten the canvas when necessary, is the only proper one to use. [11]

For convenience of use many kinds have been invented, but you will find the one here illustrated the best for general purposes. The sides may be used for ends, and vice versa. If you arrange your sizes well, you will have the sides of one size the right length for the ends of another. Then you need fewer sizes, and they are surer to pack evenly.

Stretchers.