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58 The Audio-Visual Handbook
permanent use. It is extremely important that high quality etched glass be used for the best results, and the best glass for this purpose costs approximately ten cents for each piece of slide size (3i4"x4").
Etched Glass Slides Using Colored Pencils. One of the simplest types of pupil-made lantern slides is made by using special water color pencils on finely finished etched glass. A set of six colored pencils will cost but fifty cents and may be used for producing hundreds of slides.
The following suggestions will be helpful in making etched glass slides :
1. If the picture to be reproduced is a freehand drawing, it is advisable to draw it first on a piece of paper, 3^4x4 inches in size. If a picture less than this size is to be reproduced, it will not be necessary to make a sketch of it. If the picture is larger than the slide size, it is usually possible to select the most important part of the picture and use it. The important details of the picture should be kept within a space approximately 21/4x3 inches.
2. Lay the piece of etched glass on the drawing or picture and trace the details in outline with an ordinary medium or hard lead pencil. Mistakes in pencil marks may be removed with art gum.
3. Color the picture with lantern slide pencils.
4. If it seems desirable to preserve the picture for future use, place a piece of plain cover glass over the colored drawing and bind the edges with lantern-slide binding tape. A piece of tape fifteen inches long is required to bind the slide glass all the way around. Wet the tape. Place it on a flat surface with the sticky side up. Hold the two glasses tightly together and place on edge in the middle of one end of the tape. Turn the glasses along the tape, being sure the edges are being kept in the middle of the tape, which will stick to the glasses. Then press the edges of the tape over the edges of the glasses and they will be bound securely.
If the slide is not to be used again, it will not be necessary to use the cover glass or the binding tape. Furthermore, the pictures may be removed by using a little Dutch Cleanser or similar washing powder with water, or by using a lead pencil eraser on the dry glass. A small bristle brush will be helpful if the slide is washed.
Etched Glass Slides Using Colored Inks. The chief advantage of the slides made with colored inks, over the slides made with colored pencils, is in the brilliance of the coloring. By thinning the lanternslide ink with water, beautiful light variations of the six colors may