When a weapon is enchanted, it glows purple. How to remove this shine? or how to change it? can someone tell me where i start?

This is governed by the ItemRenderer. See ItemRenderer.render().

You can either define your own custom renderer: https://forge.gemwire.uk/wiki/BlockEntityWithoutLevelRenderer

Or if you look at the default renderer it checks ItemStack.isFoil() which delegates to Item.isFoil(ItemStack).

The default implementation of that checks if the ItemStack has enchantments.

So you could do:

public class MyItem extends Item {

--snip--

    @Override
    public boolean isFoil(ItemStack ignored) {
        return false; // never looks enchanted
    }

That method is normally used to do the opposite, e.g. make potions look enchanted when they are really not.

Thank You! is it same!