For anyone else who makes this mistake, I got the following response from Ilford:(posted 8267 days ago)To: US-techsupport/US/ILFORD@ILFORD cc: Subject: New v. Old Delta 400 (120 size) developing problem
"The old version of the film was labeled as "ILFORD 400 DELTA PROFESSIONAL", The new version is "ILFORD DELTA 400 PROFESSIONAL", with the 'Delta' and '400' reversed. This is the only way to tell them apart.
Regards, David Carper ILFORD Technical Service"