Greg Cox wrote:

As I recall, there's also a brief color sequence near the end of Portrait of Jennie--during the climatic storm scene.
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Early color was not that different from early 3D* in that respect. Witness the inexplicable use of 3D in one reel of
Harry Potter and the Half-Blood Prince and a couple of scenes in Francis Ford Coppola's
Twixt.
*Early, of course, in the latest cycle of 3D movies. Of course, it also took a few technical innovations before color was widely adopted.