Erm, not really.
It involves boosting the cyan mostly, but in very specific ways. Film doesn’t fade evenly, the highlights end up with the most fade, so it is a matter of looking at the fade across each layer of film (CMY) and working out how much it has faded at each level and in each channel.

Having a good colour reference is essential for this, then you can do some fun computations based of probability density functions to get the two sources to match, and then use the results from that to correct the rest of the reel.

It is based on this technique http://www.mudgee.net/ot/colourgrading.pdf

The basics are here: https://originaltrilogy.com/topic/Colour-matching-for-fan-edits/id/7257/page/1

Dre’s tool originally started off using this technique and then he went a lot further, but the images I’ve used on the front page of my other thread, where the very faded ‘red’ German print is adjusted to the less faded print are using the code from the links above, and then some more correcting in Nucoda.

The images on the front page of this thread are from the other print I had access to which was only very slightly faded, but unfortunately had a lot of mold on a lot of frames. That print will be used for any frames that are damaged/missing on the new print.

Hope that helps!