WheN the photograph you desire to color is mounted on a card, first immerse it in boiling hot water This will soften the paste, and in a short time the print may be lifted from the mount. Do not hurry, but give the print a thorough soaking before trying to lift it from the card, and always use great care to avoid tearing the photograph. Rinse the picture in cold water to clean it from the paste and coloring matter that may adhere to it from the card. Let it remain in the vessel of clear water until ready for mounting on the glass. Prepare a little thin starch paste, as follows. Amylum (Refined Corn Starch) a teaspoonful, cold water 2 ounces, or nitrate strontium 1/8 ounce; stir till dissolved, then bring it to a boil, stirring constantly.
Have the starch paste thin and strain it through fine muslin. Having cleaned your Convex Glass thoroughly with alcohol and a piece of cotton batting, take the photograph and blot off the surplus water. Paste the face of the print and the concave or hollow side of the cleaned glass with your starch, being very careful to cover both the print and glass smoothly. A wide bristle brush is most suitable for this work. Lay the print on the glass, the prepared surfaces together, and proceed carefully to work the bubbles out with your fingers, after which lay two or three thicknesses of tissue paper on the print, and with an ivory paper-knife, or flat stick, with curve about the same as the concave surface of the glass, work the print down to the glass forcing out all the air. Work from the centre of the glass toward the edges, and with great care, using very light pressure to avoid breaking the glass. The mounting of the print should be done quickly, as the paste dries very fast. If any bubbles should remain, prick them through with a fine-pointed needle and rub over with the ivory knife. After mounting the picture on the glass allow it to dry thoroughly. Now fill the concave or hollow side of the glass having the picture on, with Castor Oil three parts, Oil Lavender one part. Allow the oil to remain until the photograph is transparent; this will take from three to twelve hours. When perfectly transparent, pour off the oil and wipe with a fine sponge until nearly dry. Your picture is now ready for painting.
The colors applied directly to the photograph are those that need no blending - such as the eyes, lips, jewelry, light rib-. bons, flower ornaments and neck-tie. Edges of ruffles and embroidery should also be touched up on the photograph. When you have finished coloring the picture on the first glass, pour Glycerine over it, being careful to cover the surface thoroughly. Drain off and then put the other convex glass to the back of the one having the print, and wedge apart from it by attaching little pieces of card-board to the second glass with mucilage.
Have the wedges very narrow and close to the edge. This separates the glasses and keeps the upper one from pressing the oiled and painted glass below. On this second glass you will color the face and other flesh, hair, drapery, and, if necessary, the background. The miniature is finished by using card-board to back up the picture, white being very effective.
Bind the edges of the glass and card-board together with strips of adhesive paper.
Caution ! Don't use Silver Gloss Starch; it will not do nearly as well as Corn Starch.