I had the exact same case recently of a batch where part A was also quite dark (dated 1228). I freaked out and requested for a replacement after everyone in apug.org and photo.net had confirmed that Part A should be clear. The reseller would insist that it was ok for Part A being dark and that it would still work according to Kodak Specifications. When I made an attempt to ask Kodak directly 'cause I didnt trust, I was never lucky to find someone that would be able to confirm. Finally I received the replacement from the reseller after much fighting, this time Part A was clear with pale yellow tone. It was dated 1305 . However, they did not take the old one back and said I could keep it. At that point , I tested it; what do you know. The Reseller was right. the Developer worked just fine side by side with another batch.