Thanks for the advice.You got to go for varied voltage ti anodising commonly called ti-dye:
View attachment 901474
Some people do this themselves - I think you principally need a variable voltage dc power source 50-250v??
The seat tube is 44cm (17'").Nice find. Would be curious to see the serial number - Sandvik typically stamped the frame size too under the bottom bracket.
The parts on it are a bit of mish-mash but nothing wrong with the XT M750/1 and LX M570.