The Petach begins with the statement that there’s a difference between “The Crystalline Dew” cited in Zohar 3, 128a — which characterizes it there as an entity “in which all colors can be seen” — and Radlah. And here’s how they’re different: while “The Crystalline Dew” presents all of the colors together, Radlah presents itself as one thing in one instance and then it immediately presents itself as its opposite.
We’ll have to refer to Ari’s references to this to understand what Ramchal is saying.
(c) 2015 Rabbi Yaakov Feldman
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