So sometime's we have colour, behind the scenes photos and we use them. Othertimes the props were reused in the Pertwee/Baker eras so we know exactly what they looked like in colour. In instances where we don't know, we make informed guesses.
For example, we had to pick the sash colour, and we...
I use a combination of After Effects and Photoshop. It's pretty hard work but I really enjoy getting the results right.
I worked with a team of people to colourise a black and white episode of Doctor Who from the 1960's.
It took six years but it was a big success. It ended up going to LA for...