Hi, I am unable to change the alpha or color of my particles. I can create a new system and the very first thing I try to do is just set the color. No matter what I change it to, the particles stay white.
The HDRP shaders don’t use vertex color, which means they ignore particle colors.
You can use the particle system HDRP shaders (packman → HDRP → extras).
Or you can find some other shader/shadergraph that uses vertex colors, and then it should work.
Sorry the support for particles in HDRP isn’t wonderful 
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Hey hey! this isn’t exactly true. if anyone finds this thread, please don’t get discouraged.
you can expose a properly in the shader graph, and manually pass in the color yourself, like so:
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Using a Particles/Standard Unlit shader worked for me, to catch all colour changes including the particle Start Color and the Color over Lifetime settings.
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Real answer thank you
Standard particle (unlit) shaders works well on the HDRP too