rates

Regular materials only for +1 - +10 (White Bone, Chaotic Metal Dust, Essence of Black Claw Nest)
Rare materials only for +11 - +18 (Crystal Bone, Gem of Curse piece, ??? new material in Black Claw Nest ???)
Rarest materials only for +19 - +20 (Diamond Bone, Gem of Truth piece, Black Dragon Bloody Crystal)
+1 - 90% (+5 regular materials for 100%) - 1 dust
+2 - 80% (+10 regular materials for 100%) - 3 dust
+3 - 70% (+15 regular materials for 100%) - 5 dust
+4 - 60% (+20 regular materials for 100%) - 7 dust
+5 - 50% (+25 regular materials for 100%) - 9 dust
+6 - 45% (+30 regular materials for 100%) - 11 dust
+7 - 40% (+35 regular materials for 100%) - 13 dust
+8 - 35% (+40 regular materials for 100%) - 15 dust
+9 - 30% (+45 regular materials for 100%) - 17 dust
+10 - 25% (+50 regular materials for 100%) - 19 dust
+11 - 22.5% (+1 rare material for 100%) - 21 dust
+12 - 20% (+1 rare material for 100%) - 23 dust
+13 - 17.5% (+1 rare material for 100%) - 25 dust
+14 - 15% (+1 rare material for 100%) - 30 dust
+15 - 12.5% +1 rare material for 100%) - 35 dust
+16 - 10% (+2 rare materials for 100%) - 40 dust
+17 - 8% (+2 rare materials for 100%) - 45 dust
+18 - 6% (+2 rare materials for 100%) - 50 dust
+19 - 4% (+1 rarest material for 100%) - 55 dust
+20 - 2% (+1 rarest materials for 100%) - 60 dust