TECHNICOLOR AND OTHER METHODS 193 



quence, tested and notched for the correct printing 

 light and cleaned carefully. 



The printing requires a special double machine 

 that makes two matrix prints at once. One made 

 from all the frames that were exposed through the 

 red filter on the downward travel of the negative and 

 then it turns and on the upward journey the frames 

 made through the green filter are printed. The 

 matrix print is a special slow fine-grained stock. This 

 is developed and treated chemically so as to leave it 

 in very strong relief. It leaves the red parts of the 

 picture much higher than the other colors and the 

 half tones in proportion. 



The matrix from the green filter is treated in 

 the same way. These two matrix prints, although 

 they may be 1,000 feet long and each have 16,000 

 frames, must match frame for frame. 



Now the real print is to be made the one used in 

 the theaters. It is made on a fine-grained slow posi- 

 tive stock and consists only of the sound track Ko of 

 an inch wide on the left side of the strip and an 

 opaque bar between, the space that is to finally be 

 the picture. But no photographic picture at all is 

 printed where it is to be on the strip, but it is just a 

 blank covered with a very thin transparent emulsion. 



This film with the sound track that is synchro- 

 nized to fit the picture now goes to the color-print- 



