To gray the colors add gray cement, and to lighten the colors add some of the white cement.
TO PLACE THE COLOR ON THE TILE, take it up with the brush and drip onto the cement surface, being guided by the tracing previously made. The color should be thin enough to flow from the brush easily and not so thick that it drips in lumps. More water should be added if too thick and more color is added if too thin. In both instances, whether water or color is added it must be ground in thoroughly. If the color settles on the glass it should be stirred again to keep the mixture uniform.
THE RELIEF OF THE COLORS can be regulated by how much color is flowed from the brush, and surfaces can be built up by repeating the strokes of color. Avoid repeating a stroke after the color has commenced to set, as a second stroke in such an instance will destroy the surface lustre. Where colors run over the boundaries they may be scraped back or taken off with a moist, clean brush.
The direct clean stroke will produce the best final results, and if preceding each stroke a little thought is given, mistakes will be avoided.
The tile surface should not be permitted to dry while working upon it and if kept in a shallow tray of water there will be less risk of it doing so. Water should never be permitted to fall upon or touch the surface of the slip painting or tile as the color will be destroyed. The tile is placed carefully into shallow water to continue hardening and in four or five days will be hard enough to remove. After drying out of water several days it is ready to use or it may be given a gasoline wash or wax rub if needed.
Tiles will harden as they age. Those that appear to be partly chalky when completed will harden in a month’s time, when the moisture from the center of the tile has completely evaporated.
THE SECOND METHOD OF SLIP PAINTING is used where three different planes or heights of color are wanted. For instance we will suppose that the subject is to be a decorative design of trees and distance landscape in three colors. This would be worked out as follows: First, cast a plain cement tile and after removing it and while damp pour a spoonful of color on the surface coating it with plain color as desired. This color should be the background color of the sketch. Second, while this coating is soft, take the lightest color (for clouds, water, boats, flowers, etc.) and with a full brush place the color onto this soft coating. It will blend and sink into the background color and remain equally flat. Third, after these colors have commenced to set, with a full brush paint in the foreground part of the design (trees, etc.), working in large masses and building up the color by repeated strokes until the right relief is secured. Avoid shading the parts and keep all parts flat in tone, even though they may be in relief. It will be found that the later color is added to the first coating the less it will sink into the background. Any design can be worked out accordingly either in relief or flat. A little experimenting will solve many questions, and reveal greater possibilities. To complete the tile it is placed in shallow water until it hardens, then let dry for several days after which it may be given a toning wash, or gasoline wash, and a wax rub.
A THIRD METHOD is to take a flat surface and slip-paint a design onto it in relief. After the color has set for a short time it can be trimmed carefully with a knife so that the sides are nearly vertical. This will give the slip-painting a decidedly different appearance and it may be left this way or other color may be added so that it comes nearly up to these trimmed sides.
AVOID LEAVING ANY PART OF THE SURFACE DRYING or setting when painting on the surface; or the tile hardening in the water too long before being painted upon, as it will prevent it from becoming durable. Surfaces can be covered smoothly when slip-painted if the color is used very thin. First cover the surface with a coating of the color to be used, immediately adding more of the color and it will flow and settle evenly.
A slip-painted color will dry dull if placed upon a tile shortly after it has come out of the mold. To secure a glaze to a color the tile should remain in the water for two days before the color is placed onto it.