16 PHOTOGRAPHIC FACTS AND FORMULAS 
Water 1000 ccm 16 oz. 
This clears the bichromate stain; after the plate has been 
well washed, develop in the developer given above without 
the bromide. 
Lioguip SAFELIGHTS.—Sometimes cells filled with liquid 
are used in front of the light, but they present no particular 
advantage. The following have been recommended : 
Deep orange (Farmer): Potassium bichromate 6 per cent 
solution in 3% inch thickness. - This is only suitable for 
ordinary plates. 
Or (Davenport) : 
Mandarin orange 20 g 154 gr. 
Water 1000 ccm 16 oz. 
Or (Wordsley) : 
Eosine 0.13 g 0.1 gr. 
Metanil yellow 3.2¢ 25 gr. 
Water 1000 ccm 16 oz. 
Or, for a darker filter: 
Eosine 04¢ 3 gr. 
Metanil yellow 2.6¢ 20 gr. 
Water 1000 ccm 16 oz. 
Or (Davenport) : 
New coccin 2¢g 15.4 gr. 
Water 1000 ccm 16 oz. 
For deep red in 1 inch thickness: 
Tartrazine 0.5 g 3.8 gr. 
Violet Dahlia BO 0.2 g 1.5 gr. 
Water 1000 ccm 16 oz. 
ors 
Naphthol yellow S lg 1 f oh: 
Violet Dahlia BO 0.18 ¢ 1.38 gr. 
Water 1000 ccm 16 oz. 
