The changed enchantment glint introduced in version 1.8 is too strong and some potions are now indistinguishable by color. Best example of this are Poison and Speed potions.
See the attached screenshots comparing 1.7 (
[media]) to 1.8 (
[media]).
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This is possibly the same underlying issue as MC-166101 - the enchantment glint gets applied for every texture layer separately - thus it's applied at least twice for potions.
The current look is intended, but we might look at changing this in the future.