The Lost / Tainted Jacob / Tainted Lost: "Damage" taken from Dull Razor causes no actual harm, allowing full use of the Razor. This is one of the only ways to see the "hurt" animation from these characters.
A character temporarily turned into The Lost by touching a White Fire Placewill die from Dull Razor's damage.
Purity: Will cancel the current effect of Purity, akin to taking regular damage. Useful for if you want to roll for a different, better effect, but can also get rid of the one you want.
The item works almost identically to the Voodoo Pin in Antibirth.