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The PO-310-61664B was ordered in October 2011 and the complaint was raised in July 2012; this means the product is out of Abpromise guarantee, which is 6 months from date of purchase.
We have sold many units of these products without receiving any quality complaint so I believe that the problem might be with storage. Were these stored in dark; if not, then conjugates might have been damaged due to photo bleaching. Could you let me know how the products were stored?
Thank you very much for your cooperation. I will look forward to hearing from you soon.
Answered on Aug 06 2012