550 NEGBETTI AND ZAMBEA, HOLBOBN VIADUCT, E.G., 



3320 Hard Crystal Varnish for Collodion Negatives, in bottles, Is. 6d., 2s. 6d., 

 and 4s. 6d. Per Pint, 7s. 



DIRECTIONS FOR USE. "Warm the plate gently by the fire, and pour on the 

 Varnish in the same manner as the Collodion, returning the superfluous quantity to 

 the bottle ; then hold the Varnished side to the fire for a few moments ; the Varnish 

 n r ill, when cold, present a perfectly hard and even surface. 



This Varnish if diluted with Alcohol (strength 62 O. P.) in the proportion of 

 5 ozs. of Varnish to 3 ozs. of Alcohol, will make an excellent print varnish for 

 preserving Photographs from fading. 



DIRECTIONS. Pour sufficient of the diluted Varnish into a clean dish, then 

 immerse the print for about two minutes, remove, and when dry it is ready for 

 mounting. A second immersion in the Varnish will give the print a better surface 

 if required. 



3320 Liquid Jet, for applying to the back of the Collodion Positives, giving 

 great brilliancy and lustre to the pictures. This preparation is not liable 

 to crack. Price 6d. per 4 ounce bottle ; 8 ounce ditto, Is. 



COLLODIONS FOR NEGATIVE AND POSITIVE PICTURES. 



3321 Thomas's Negative Collodion, with Potassium lodizer, Cadmium lodizer, 



Bromo-Cadmium lodizer, or Bromo-Potassium lodizer. 1 pint 10s., 

 ^-pint 5s. 



3322 Thomas's Positive Collodion and lodizer,, in pints 10s., i-pints 5s., |-pints 3s. 



3323 Mawson's Negative and Positive Collodion, i-pints 2s. 9d., i-pints 5s, 



pints 10s. 



3324 Card Mounts, for mounting Stereoscopic Paper pictures, per 100, Is. 6d., 



2s. 6d., and 5s. 



3325 Enamelled Stereoscopic Card Mounts, per gross . . .066 



3326 Card Mounts, stout, for Carte de Visite Pictures, per 1,000, 10s. 6d. 12 6 



PURE CHEMICALS AND PREPARATIONS. 



USED IN THE PHOTOGRAPHIC PROCESSES. 



s. d. 

 Peroz. 



3327 Acid, Acetic, Glacial, Solid at 50 , . per lb., 2s. 003 



3328 Citric, Crystals .... per lb., 3s. 004 



3329 Formic 006 



3330 Gallic 008 



3331 Hydrochloric, Pure . . . per lb., 8d. 002 



3332 Nitric, sp. gr. T450, pure . ..per lb., Is. 6d. 002 



3333 Pyrogallic, pure English 040 



3334 ., Succinic .......... 056 



3335 Sulphuric . . . * . . . per lb. 003 



3336 pure 016 



3337 Tannic, pure Soluble ...... 010 



3338 Alcohol per pint, 4s. and 5s. 004 



3339 Absolute, sp. gr. -796 ,. . 7s. 6d. . 006 



