80 SCIOPT ICON MANUAL. 



from a window facing the north sky. Glass has a smooth 

 and a rough side; the smooth side is that on which the 

 drawing is to be made ; it may readily be determined by 

 drawing the finger-nail over the surface. The glass 

 should bo carefully cleaned with water, to which a solu- 

 tion of ammonia has been added. A fine brush, or cheap 

 gold pen, may be used for drawing outlines, which should 

 be made with colors suited to the part of the painting 

 for which they are to be used; the foreground being 

 drawn with bolder lines than those more remote. 



One of the most difficult things to accomplish in trans- 

 parent painting on glass, perhaps, is to lay on a uniform 

 tint, free from lines or specks ; as a clear blue sky with- 

 out clouds. The brush should be well charged with the 

 blue tint, and the color spread or floated upon the glass 

 as evenly as possible, and afterwards equalized by a 

 careful application of the brush dabber : that is a camel- 

 hair brush cut down (as shown in Fig. 25), the edge of 

 which being afterwards passed through a flame so as to 

 remove any straggling hairs. The finger, also, may be 

 used as a dabber, and when used with dexterity, is very 

 effective. To take out the necessary lights, as those of 

 clouds, and to soften the edges, a stump made of leather 

 or paper may be used. In coloring photographs the out- 

 line and shading are provided; so that flat washes of 

 color are to be laid on, and then retouched and improved ; 

 avoid covering the deepest shadows, thus destroying 

 their transparency. Breathe on it sufficiently to moisten 

 the colors, and carefully blend and harmonize the tints; 

 commence with the sky, then the middle distance should 

 be worked out, lastly the foreground. As the pictures 

 are necessarily small, a magnifying hand lens, such as 

 is used by artists for fine work, is desirable to assist one 

 in coming close to the lines with washes of color. 



