Back in the 1990s Harlequin Miniatures produced a licensed range of 28mm metal miniatures and I bought back a few of the blisters, including the robot mummy.
The Robot Mummy in the TV series was quite an aged light brown colour, certainly not white.
I gave the four models I had, after undercoating, a basecoat of Vallejo Ivory (918).
After that I brushed over the models a watered down brown wash.
The rear view.
This was to “age” the bandages.