What exactly is the Ash in Betta foods?

[TheCheese909]

I'm reading all the stuff on my Betta foods, pellets and flakes, and I see on acouple of them under the Guaranteed Analysis there is Ash, which is at 8% on the Omega One foods, both pellet and flakes and the NLS Small Fish Formula. Out of the 8 different foods I have these are the only one that mentions Ash.

So, what exactly is this 'ash' made up of? Anyone know?

[Olympia]

Ash includes stuff like scales, bones, and shells. I wish I could tell you if it was good or bad, but we honestly don't know. Usually though you want as little ash as possible.
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[TheCheese909]

Oh okay, that would make sense. I was curious as to what it could possibly be, i have 8 different types of pellet and flake foods for them and was just looking to see if i could find the overall best based on their ingredients and guaranteed analysis.