VARNISHES 157 
Turpentine 1000 ccm 16 oz. 
Nitrobenzol 100ccm_ 1 0z., 288 min. 
ReEtToucHING Mepium.— 
Pure American turpentine 43ccm 1Y4 oz. 
Oil of spike 14.2 ccm YZ oz. 
Pale resin 28.3 g 1 oz. 
Raw linseed oil 0.5 ccm 8 min. 
Terebene 1.2 ccm 20 min. 
-Amyl acetate 7 ccm Y4 oz. 
If the solution is too thick, dilute with turpentine. Apply as 
little as possible with the finger tip. 
BLocKkinc-ouT MEepIumM.— 
Gum sandarac 500 g 8 oz. 
Denatured alcohol 1000 ccm 16 oz. 
Dissolve by allowing to stand in a warm place with constant 
stirring, carefully decant from the residue, and add lamp 
black to give a suitable consistency. 
FIXATIVE FOR CRAYON OR PASTEL WorkK.—This also forms 
a good varnish for prints: 
Mastic 8.3 g 64 gr. 
Amy] acetate 500 ccm 8 oz. 
Dissolve with constant stirring, allow to stand some hours to 
settle, and mix with: 
Celluloid Pe 18.5 gr. 
Amy] acetate 500 ccm 8 oz. 
This should be applied with a spray diffuser. 
STRIPPING Fitms.—The film can be easily stripped from 
negatives by one of the following processes. First, lay the 
negative face up on a smooth support, and cut right through 
the gelatine down to the glass with a sharp knife, about one- 
eighth of an inch from the edges. Then level the plate, and 
pour on it a little of the following solution: 
Glycerine 37.5 ccm 288 min. 
