The Two Color Process - Technicolor 100

Technicolor’s two-color subtractive camera was designed by 27-year-old Joseph Arthur Ball in 1921. It used a beam-splitting prism behind the lens to divide light into two paths; half was filtered red and the other half green. These two color records were then captured onto black-and-white film one above the other, vertically flipped. Because this technique used only two color separations, the process was incapable of replicating accurate blues, purples, and yellows, although pleasing results could be obtain