here is a site with pictures of a 95 M5 Touring in Santorinblau. it seems to be a lighter shade of blue than Laguna Seca. as far as "Santorin Blue" goes, i always thought that was an Audi factory color.
i don't have pictures of LSB, but i'm sure you know what it looks like by now (smurf blue), and Audi's Santorin Blue is a dark blue metallic, not quite as dark as BMW's Carbon Black, but similar.
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