Issues with reducing visibility of armoured vehicles arose as soon as these vehicles were first used. Like 100 years ago, opposing sides aim to locate enemy vehicles in motion, during stops, and during combat, determine their type and number, and also make the same as difficult as possible for the enemy. It's not easy to conceal a tank from the enemy, especially in winter. Areas covered in snow make dark objects (such as tanks in basic camouflage) very noticeable. How was the issue of camouflaging tanks in winter handled in the Red Army?
https://warspot.net/349-red-army-s-white-tanks