In addition, ghoul frog skin, once dried and powered, can be a useful ingredient in the manufacture of magical inks used to transcribe various spells. It is predominantly used for such light-based spells as faerie fire, dancing lights, and so on, but it can also be used for corpse visage and similar spells that deal with at least the appearance of being undead.
Ghoul frog blood is a vital ingredient in the manufacture of skeletal potions (see Dragon Magazine #198, “The False Undead”), which turn the imbiber’s skin and organs invisible
but leave his bones unaffected. In a pinch, it can also be used to create potions of invisibility, but such potions are usually inferior in terms of duration and often cause a flickering luminescence that negates the benefits of the invisibility.