Help restoring original colours to this photo?

Often a color cast will still have hints and shades of the original hues in it.

This doesn't appear to have enough to recover with traditional color correct in Levels/Curves, etc. I think you're going to have to take the time, convert it to black and white. And then create a layer and set it's blend mode to Color. Do this for each component of the picture. Think "Skin" "clothes" etc... Now paint in the color you want to get a solid base color for the photo. Now you can go back an shade the picture with additional tones and stack layers above the base color layer.

Do you know what?  I'd go ask on Retouch Pro.  They are a site cleverer that us at this sort of thing.

https://www.retouchpro.com/

[EDIT]  I just checked it as a B&W and it is none too flash, so I'd give them a much higher resolution version of this picture to play with.

I agree with Theresa. Use the Channel Mixer to put the green channel into the red and blue, and had color.

You are going to have to get creative and guess at what the original colors were, and then hand paint them back in. The original colors are pretty much gone from this scan.

Hi there,

As you're looking to restore and old image and color correct it, please have a look at this video and let us know if it helps: How to Repair and Colorize Old Photos (Photoshop CC Tutorial) - YouTube

Regards,
Sahil