Can I ask how either of those posts offered an answer to what was a genuine question on my part?
I'm sure it was not a ground breaking special effect, but I am interested to know as I don't know. I sometimes like to learn new stuff.
My choice of English was slightly tongue in cheek. I don't consider the phrase I used has any bearing on the outcome of the discussion. Please desist with making comments about phrases I use in written form, my choice of words was non consequential to you as people, so consider the impact that you may have on me. You both came across as being mocking, whether it was intended or not.
No need to be cranky, but I am sorry if I offended. My main points were that (a) jokingly, thinking of 1993 as "way back" made me feel old, and (b) lots of fancy visual effects were in use back then. This particular effect, as Tanalia said, was done by 'rotoscoping', projecting the sequence frame-by-frame, hand drawing a matte around the part to be left in color, then desaturating the color on the rest of the frame.
Bonus trivia: The rotoscoping technique was used at least as far back as 1937. In Disney's
Snow White, live actors were filmed, then animation frames were hand drawn over each frame; this is why the animated characters were so lifelike in their movements. It could be thought of as a predecessor of the motion-capture technique used for Gollum, et al.
Again, apologies if I offended. We joke around a lot here and that was the spirit in which it was intended.