I only have a Chemistry bottle, not the packing carton. How can I determine from the Lot number the “Best if used by” date?
A typical Lot Number would look like this: 01204 2 (see figures below). The first digit is an internal control. The next three digits “120” indicate the Julian date of production; this Chemistry was made on the 120th day of the year, April 29th. The fifth digit, “4”, indicates the year of production, 2004. The last digit after the space, in this case a 2, indicates that this bottle belongs to the second batch produced that day. Air Techniques Chemistry has a one year storage life. So, this bottle is “Best if Used By” April 29th, 2005. On each bottle of Developer and Fixer is a date code stamp. To determine the Best if used by date, drop the first number. The next 3 numbers are the Julian calendar date and the 5th number is the year. The 6th number is the batch number of the day. The shelf life is one year from this date. The example shown is the 120th day of 2004 (April 29 2004), batch number 2. A/T 2000 & Peri-Pro Developer and Fixer This example shown is the 54th day of 2004 (Februar
