Question: what are the chances of you getting black ice?
Answer: 1.88% chance of a black ice, 0.05% (1 in 2000) chance of a specific black ice (based on 250 purps available) | EDIT: 0.94% chance of a black ice, 0.02% (1 in 5000) chance of a specific black ice (based on 500 purps available) | This assumes all purples have the same chance, and there are no hidden rarity mechanics ...