Niagara Fluids FX - Transparency/Alpha problem

Hello! I’m having some trouble making a gas/smoke explosion at Niagara Fluids. Everything is great, perfect, just one thing. When the FX starts, I see that the smoke is too thick and I don’t know how to tell Niagara that the FX starts semi-transparent. Not “solid”.
I’ve tried Color, Color Scale, Curve Temperature, etc., but nothing works. I can’t control the “initial alpha”… Transparency.

Adjustment this parameters
EMITTER SUMMARY \RENDER \ RENDER DENSITY GAIN

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