What is the drop rate, C8 ampoule ?? impossible in drop

hello everyone here already 2 days that I farm like crazy to drop this famous ampoule C8 so I decided to resume the floors I took the floor at 88 to get to this day at floor 114, I N IS DROPPER ZERO AMPOULE C8 how does it do ??? I farm more than 20h in 2 days nothing, it starts to disgust me

What is an ampoule C8 ?

@Balmert quote:

What is an ampoule C8 ?

It's a material that allows you to evolve your gear from Chaos 7 to Chaos 8.

https://www.youtube.com/watch?v=h0YKmHn0JBc     <- Juicebags video on the subject before you get too excited about a c8 amp. 

i went from floor 145 to 149 thats 12 maps, got 2 defender packs and none of C8... small sample thought

also i would like to know a bit more about that increase in drop chance as you climb floors, every 5 floor yes, but is an little increase per floor or bigger step at -5 floors?

Not sure if drops from red chests (i know where it droped on test but i cant talk about it) or from mobs like other C1-C7 ampoule