How to darken particles which are using "add" blend?

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:bust_in_silhouette: Asked By Sprowk

I’m using particle textures with a black background. With blending set to “add” on particles it works. However, the particles are washed out on a white scene. Is this the proper way?

If it is then how can I make them darker? If not then how should I use them or is there any trick to reliably replace black with transparent colour?