[Abel D.]

You can buy this footage at 40 bucks a piece at istockphoto. for the miami ink effect and using matte and luma mask as someone described above.

https://www.istockphoto.com/file_closeup/everyday_items/writing_utensils/inks/2329805_ink_splat_series_2_hd.php?id=2329805

https://www.istockphoto.com/file_closeup/everyday_items/writing_utensils/inks/2812412_ink_splat_series_3_hd.php?id=2812412

cheers