This is a simple tweak, like the ones I have been making, where I took the color scheme from the iron nugget and applied it to the iron ingot texture. This makes the ingot more blue and colorful. Normally, it is just black and white.

I have constructed the pack in a way that makes it compatible with any version above 1.6 (Maybe even a bit older but I don't know why you would play 1.5 or below).

Enjoy!