Saltpeter

Saltpeter is used to craft the following items:
 * Dancing star
 * Devil's puffball
 * Dimeritium bomb
 * Dragon's dream
 * Grapeshot
 * Moon dust
 * Northern wind
 * Superior northern wind
 * Samum
 * Zerrikanian powder

Saltpeter is a high quality bomb-making base, meaning that it allows Geralt to make bombs which require up to four ingredients.