Phthalocyanine dye, developed and patented by Mitsui, and the research partially funded by Kodak, is more sensitive to the laser writing. Phthalocyanine dye reacts in a "burst" mode instead of in a "melt" mode as with cyanine (blue) dyes, so sharper pits are created. These sharper edges are easier for CD drives to read, so more faithful sound reproduction is possible; more reliable data is stored.

When you "burn" a disc, your writer creates "pits" in the dye layer that make up the "0"s and "1"s for digital recording. Phthalocyanine dye reacts more quickly to the writing laser than other dyes.

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