Facing bricks on old bricks

So, as mentioned above, she imagines klinker slips like the Wiesmoor sand gray coal from Röben in the lower area.

I found something on the internet about "Whitewash" or "Limewash." It doesn't seem to be well known in Germany, but very much so in the USA. It looks quite interesting.

So, as written above, she imagines clinker slips like the Wiesmoor sand gray coal from Röben in the lower area.

Where should I have overlooked that? - mottled like that also works, as airbrush; not cheap, therefore I would only use it accentually as in my previous example.