If you wanna hex someone, we're not gonna stop you. But we will stay out of your way!
 
This stuff was stewed over for a long time. A mixture hatefully combined with spite and vengeance. I spent several moon cycles, including a blood moon, stirring it all up and swearing at it. (You know - telling it to go fuck itself, that it deserves to live in a hell yet unknown, that sort of thing.) This stuff is misery encarnate and will exist only to ruin whoever you should unleash on it. 
 
Can burn as part of a spell, or put a few drops in someone's shoes or under their desk or something. Incant your hex and then leave the scene of the crime. ASAP.