Enhanced potions and arrows of the Turtle Master have a different color from the other variants

When comparing the color applied to the normal and extended potions and arrows of the Turtle Master with the enhanced version, it is slightly different.

Steps to reproduce the issue:

1. Make potion_overlay.png or tipped_arrow_head.png a 16x16 pure white (#FFFFFF) square.

2. Take a screenshot of the normal, extended and enhanced items in your inventory.

3. Use any image editor and color pick all of the tinted items.

Expected result: The color should be the same across all 3 variants.

Actual result: Enhanced potions and arrows of the Turtle Master have a different color from the normal and extended variants.