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One of the issues is that the tanning process requires the use of toxic chemicals, that are afterward often released to the environment.

Well - they could just tan the leather the old fashioned way and use the cow brains.

Yeah, but then what would they make dog food and jello out of?

/s

I'd love to see Apple's slick marketing video about how your new Apple Watch strap was tanned with cow brains.

"we asked ourselves what would a cow think about this?

so to do that we really wanted to get inside a cows brain.

we figure dok now that we're here, let's explode it out onto the platter of dead skin of that same animal to capture it's essence.

so without further adieu

I present to you

iBrainSplatStainedWatchStrap"

Prionic Shield™

USA & europe tanneries are usually pretty regulated and treat their wastewater. Other countries may vary.