Mercedes are silver because they stripped off white paint in 1934
The legend is that Mercedes, and in general German racing cars, race in silver because of an incident at a race in 1934. The tale, one told by team chief Alfred Neubauer and even Mercedes themselves, is that the team’s car for the ’34 Eifelrennen was too heavy for a 750kg weight limit, so they stripped the white paint from the car to get it below that limit.
The problem is that the cars ran before the race, and no images show them in white. Also, the regulations at the time of the race do not include mention of a 750kg weight limit. The paint stripping story appears to have been added into history by Neubauer’s autobiography, and several drivers later added it into stories they told. The simple story is that the silver arrows have always been silver. To be fair to Mercedes, before its anniversary race at Hockenheim – you know the one that went so wrong, Lewis Hamilton had a minute-long pit stop? – the press release referred to the story as a “legend”.
It is worth noting here that German cars, including Auto Unions, did run in white in their time, but there is no real evidence that the paints were removed for weight reasons.