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Bomb making requires the "Bomb Preparation" skill (a silver Intelligence talent), so Geralt can not make bombs until he reaches level 15 at least (and then only if it is really a priority as other talents are much more useful). He can, however, use any bombs he finds. Bombs require alchemical ingredients, just like potions, but the bases are different. All bomb-making bases are referred to as "black powder" irrespective of the actual colour of the item.

Top quality bases[]

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Zerrikanian mix
Zerrikanian mix 40 oren(s) 8 oren(s)
Alchemist's powder
Alchemist's powder 70 oren(s) 14 oren(s)

High quality bases[]

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Saltpeter
Saltpeter 10 oren(s) 2 oren(s)
Stammelford's dust
Stammelford's dust 20 oren(s) 4 oren(s)