The correct colour of WWI tank tracks

Carburisation was a complicated process when minimising warping/deforming on a new track plate.
The standard 20,5" wide track was a well-understood process and produced a track plate that was of a standard quality.
However, making the plate 24" wide instead of the 20,5" produced a major headache! The MkV tank was supposed to have the wider plate, but warpage during the carburisation process brought about a long delay until a satisfactory track could be produced, so much so that the MkV had initially to be fitted with the standard 20,5" tracks.

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So it’s possible the Germans were using the same process at Krupp… hence their unintended multi-plate result with the A7v.