It can be left out or you can use garlic powder.
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1/8 teaspoon of garlic powder is equivalent to 1 garlic clove. Either may be substituted for the other.
Black powder absorbs moisture from the atmosphere
Manganese dioxide (MnO2) is a black powder.
Pyrex was created in 1915.
Black powder is much weaker than smokeless powder. Smokeless powder, for this reason, once invented(much after black powder), replaced black powder in guns. However, black powder is still used in fireworks because the extreme explosive power of smokeless powder would prove too dangerous in fireworks.
Black powder, or a black powder substitute such as Pyrodex. Smokeless powder (modern gun powder) should not be used in a traditional muzzle loading firearm.
no
Either FFFg black powder or Pyrodex P may be used.
Pyrex usually cleans up pretty well if you just let it soak then scrub normally (and repeat as needed). If there's material that you really can't get off and you don't have scouring pads (like SOS) you can use baking powder (like Arm & Hammer). It isn't unusual to have some discoloration around the edge on a well used pyrex :)
You can substitute regular mustard or a mix of mustard powder and vinegar for Dijon mustard in a recipe.