How did the bright colors of some World War II tank camouflages

Help with Type 97 Late colors and pattern - Armor/AFV - KitMaker

Russian Tanks of World War II: 1939-1945 (Technical Guides): Hart

Camouflage aircraft, tanks, etc.

Events

Tamiya Paint Database – UK WWII AFV colours – Replikator

Is it common for armies to wear bright colored uniforms instead of camouflage or other forms of concealment? - Quora

Were German WWII tanks painted in camouflage from the factory or

Is it common for armies to wear bright colored uniforms instead of camouflage or other forms of concealment? - Quora

Modelling