We did prepared Nerd samples (no dye) with existing Mergal K9N and new Troyguard CM1.5. Both have the same formulation/dosage except the Kathon. The samples are marked to differentiate in A (2 pcs) and B (2 pcs).
Could you pls ask supplier to help conducting the preservative efficacy test comparison between both Kathon (A &B) in order to ensure that the change in Kathon does not impact on microbial contamination.
Attached is the PET test for Nerd that our HQ ever done when changing the gel. Please apply using this method for the test.