D50 is not the same as D50: Standardized light and ISO3664:2009
Since 2009, printers and proofing service providers have increasingly encountered a new D50 lighting standard: ISO 3664:2009, which defines how the new D50 standardized light, under which proofs and print products are to be evaluated, looks like. The new standard light contains UV components that address the optical brighteners that are frequently used in offset papers nowadays. The result: next to a bluish-white glowing sheet in the pressroom, there is a yellowish-pale proof. What is the reason for this? The standard came sort of as a surprise and was poorly …