Dear Otsuka san
As you requested to check APHA by UV method, I have already communicated to all of related person and sticky check APHA every batch by Lab and PD team. The result of every batch were on spec (minus value) as shown in every test report for each batch transfer (D-5550 and 2D-5550).
Anyway, I attach the example test report for D-5550 that shown APHA -3.6 naka.
If you have any concern or suggestion, please feel free to discuss ka
Sincerely yours,
Emmy