Just as a matter of interest, does anyone know how to match Forte's lot nºs with manufacturing dates? I've just dug out and printed a photo from a box of 50 24x30 cm Fortezo sheets with a lot nº of 5210582. If memory serves me right, it must be pushing 30 years old, yet there appears to be no sign of fogging and the print quality isn't at all bad.

