COLOUR PHOTOGRAPHY 273 



DYES FOR COLOUR TRANSPARENCIES (Von Hiibl). 



Red Bath. For positive from green negative. 



Water 100 c.cm. 



Erythrosine (1 in 200) 5 



Alcohol 10 



Blue Bath. For positive from red negative. 



Water 100 c.cm. 



1 Fast green, bluish (1 in 200) 20 



Alcohol 10 



Acetic acid 10 drops 



1 F. Beyer and Co., London. 



Yellow Bath. For positive from blue negative. 

 Water 100 c.cm. 



2 Napthol yellow S.L. (1 in 200) 10 



Alcohol 10 



. Saturated chrome alum solution 5 



Acetic acid 10 drops 



2 Actien Gesellschaft fiir Anilin Fabrikation, Berlin. 



SCREEN PLATE PROCESS 

 1. Development. Rodinal, 1 in 10. 



Autochromes 4 minutes at 60 F. 



Paget 2J 



Metol-Quinol. For Autochromes. 



Metol 32 grains or 4 grammes 



Hydroquinone 96 12 



Sodium sulphite 4 ozs. 200 



Potassium bromide ... 50 grains ,, 6 ,, 



Ammonia (-88) J oz. 20 c.c. 



Water 20 ozs. ,,1000 



Dilute 1 part with 4 parts water and develop 2J minutes 

 at 60 F. 



For Dufay Plates. 



Metol 50 grains or 6 grammes 



Hydroquinone 17 ,, 2 ,, 



Sodium sulphite 1-J- ozs. 75 



Potassium bromide. . .17 grains 2 



Ammonia (-88) J oz. 12 c.c. 



Water. ..20 ozs. ,,1000 , 



