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They record color under.
A unique feature of Cartrivision is that it uses 1-of-3 skip-field recording to save tape, that is, it records only one out of every three video fields for a total of 20 fields per second. This is acceptable when home recording live video, but when home recording broadcasts of 24 frame per second film (which was also much of prime-time programming) it results in jerky motion due to completely losing a film frame 4 times a second. Cartrivision had a method (for pre-recorded movies only) of blending two film frames together 4 times per second. This meant that the motion blurred instead of jumping. This technique required use of a video frame store at the recording site, which was inconceivable to include in a home device at that time.
Another thing that Cartrivision worked on was high-speed duplication of pre-recorded tapes by means of magnetic contact printing.
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