That stinks Bue
Hope you two shrug it off quick.
That Purpleheart and any other wood is going to change color no matter what you try to arrest the process.
I got this info from the USDA Wood Handbook. All wood is high in oxygen, in addition to minerals, soluble extractives like resins and colorants, and sugars like cellulose. The soluble sugars are acids and will react with the oxygen when the structure has been disturbed by cutting, etc. and polymerization starts to breakdown the extractives. So its going to happen even if you minimize the external influences like UV and atmospheric exposure.