Potential answers for "It's duller than cobalt"

⭐⭐⭐⭐ SLATEBLUE
⭐⭐⭐ AMETHYST
⭐⭐⭐ ARID
⭐⭐ OPIATE
⭐⭐ METAL
⭐⭐ DEEPBLUE
⭐⭐ ISOTOPES
⭐⭐ ISOTOPE
⭐⭐ AZURE

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