Originally Posted by
Drew Wiley
The key ingredient of 130 is glycin. And 130 is NOT as cold tone developer, although you can tweak it a little cooler by increasing the hydroquinone and substituting benzotrizole for the KBr restrainer; but that pretty much spoils the look 130 is prized for. Rather, it's the warming effect of 130 when combined with a cold gold toner like GP-1 which creates a deep neutral black. Again, the proof is in the pudding, including with respect to MG Cooltone, which simply doesn't go truly black otherwise in my experience. Alternative MQ and PQ cold tone developers just lend that annoying greenish-inflected Dektol look to it.
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