Am 30.10.2012 15:56, schrieb Alain:

>> * too much random variation of colours: colour of bricks came from the
>> temperature in the oven, nearby bricks in the oven get the same kind of
>> colour... and nearby bricks in the oven ends up as nearby bricks in the
>> package... then nearby bricks in the package ends up on the same row or
>> nearby rows (unless you are a Netherlander, in which case you might have
>> a white package and a red package to pick from in order to make some
>> motifs).
>
> The colour variations in this image are very similar to those I see
> every day in my, and several others, neibourhood. The colour variation
> don't come only from the cooking temperature but also from the pigment
> used, and how well mixed in it was, and variations in the clay used.
> Older houses have much more variation than recent ones reflecting both
> hovens having a more uniform temperature and improved mixing equipment.

Mixing of different batches of bricks may also have been common in large 
European (especially German) cities after WW2, when people gathered 
intact bricks from the ruins. (Those bricks might also have been subject 
to fires, which might have introduced additional color variations via 
soot and heat.)

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