READ AND IF STILL HAVING PROBLEMS UNDERSTANDING MESSAGE ME AND I WILL EXPLAIN BETTER!
Okay the reason for special ingredients in magick is because it make the spells more powerful. It isn't a necessary thing to have, but if it is a weak spell (again the only reason it will be weak is if the caster is still unexperienced), the magick will not work, as though so magickal spells will require the need of potions, in act of the person who wrote it.
REASONS WHY THE INGREDIENTS DIDN'T WORK!
There are multiple reasons why the ingredients do not work; Below I will produce the reasons why:
*You did the ingredient in a improper order.
*You missed a important part of the ingredient.
*You have no belief that the spell will work and so the ingredients become non-avoided.