We have tested the seals on jars in our stock, and some do come loose while others do not. We do not feel it necessary to replace the product, but if your requirements dictate that we do so we will include them with next week's shipment.
We have only had one other incident with the blackening of the seal. Although we have been able to determine the cause of the problem, and have taken the necessary steps to correct the situation, please return the jars on EL15005 so that we may also analyze them. You may use the RMA number from my previous email, 150728ABS.
Since only one incident besides TKB has been reported, and in both instances the darkening was on the seal between the aluminum seal and the plastic lid, the discoloration was only on the paper seal and the gel was totally protected by the aluminum seal. There was no contamination to the gel within the jars.
The corrective action has been taken to prevent this problem in the future.
Please let us know if our response is acceptable within your guidelines.