Pz. Kpfw. I Ausf. A in Chinese Service
The Battle of Nanjing, 1937

Regarding their paint schemes, the Panzer I’s were almost certainly pre-war three-tone as they would have been painted by the Germans, as opposed to the later Panzer gray scheme. Photos seem to show them to be a single color, but this is likely due to the paint fading / being worn, the tank being very dirty, or an inherent problem with black and white photos – especially poor quality prints or digital renderings of them.