Pourquoi la pierre noircie ? La pollution atmosphérique laisse des traces noires, encrasse et attaque la roche. Cela rend littéralement l’air opaque aux pierres. Comment […]
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Pourquoi la pierre noircie ? La pollution atmosphérique laisse des traces noires, encrasse et attaque la roche. Cela rend littéralement l’air opaque aux pierres. Comment […]
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