Kryolan blood capsules are activated when an actor bites down on them.
The actor's saliva mixes with the powder to form fake blood in the talent's mouth.
The capsules and powdered stage blood inside are both safe to be swallowed and digested.
You can think of the powder as
Sold in packs of ten (10).
3.25 x 1 x 3.25 (LWH in inches)