Still Needing Stained Cups for Our Testing

We are still needing stained menstrual cups for our stain removal testing. Manufacturer irrelevant.
Material irrelevant.
If your cup qualifies you can be compensated in a free new menstrual cup.

What qualifies? We are specifically looking for stained cups that have not been heat treated. If you wanted to stain your cup with blood the way to do it would be with heat. In other words if you have a bloody cup and throw it into boiling water you greatly increase your chances that the stain is permanent.

We would love to get a stained cup that has been cleaned with soap, remains stained, but has not been heat treated/disinfected by boiling.