TikTok user Lilli Madsen caused a stir when she shared the 'gross discovery' she made inside her bottle by the cult brand Frank Green ... out covered in black stuff every time I put it inside ...

and it does the job of a bottle but the container that holds 750ml of Green Code Kentucky Straight Bourbon Whiskey is five times lighter than a glass bottle, is fully recyclable and has an 84 ...

Yes, that black stuff is mold ... There are some common ones that may colonize your bottle: Cladosporium, which is known for its dark green or brown appearance; Penicillium, which can manifest ...