ELEMENTARY PHOTO-MICROGRAPHY. 125 



with a powerful light through a good lantern, in 

 addition to other advantages. 



A lanternist can often improve the picture 

 from a thin slide by lowering his light, so that 

 the image on the screen gains contrast by a less 

 brilliant light. 



COLOURING LANTERN SLIDES WITH ANILINE DYES. 



Some objects need colour to differentiate various 

 parts, and it is quite easy to make a lantern slide 

 as effective by means of aniline dyes as a double 

 or single stained mount from which the photograph 

 has been taken. Or the natural colours of any 

 object may be faithfully reproduced for pictorial 

 effect. 



The points to be remembered are few and 

 simple. Avoid fugitive dyes, and use only trans- 

 parent colours. An excellent outfit is supplied 

 by the Vanguard Company for is. 6d. 



With the slide on a retouching desk, wash over 

 the gelatine film with a large sable brush charged 

 with clean water, or soak the slide in water two 

 or three minutes, to remove greasiness and prevent 

 blisters, then leave it till it shows a dull damp 

 surface. The slide will now absorb colour without 

 any tendency to overrun the boundary lines. Work 

 with a hand magnifying glass for details, and 

 use two brushes one charged with colour, and 

 the other just moistened with clean water for 



