doubt about Added "damage" mechanic

So, if i use an added cold gem in a spell. does the damage added of the support gem scales with spell damage or cold damage?.I mean, the spell damage/cold damage multiplies the damage of the spell before the additional damage or after?
After. Added damage support gems add to the base damage of the skill they support.
I have wandered through insanity;
I have walked the spiral out.
Heard its twisted dreamed inanity
In a whisper, in a shout.
In the babbling cacophony
The refrains are all the same:
"[permutations of humanity]
are unworthy of the name!"

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