Nice one Kreso, is it yours? Where did you get it from?
Silverstone is a tad to dark for my taste, whereas Titanio could appear too light. I agree with you that Grigio Ferro is the best shade of grey.
Only bad thing: the latter is a colour from the 50's - 60's colour range, which will cost you what? 8.500 Euro or something, by all means just too much for just a grey.
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The secret of life is to admire without desiring.