Page History

...

Age – When enabled, the particle age channel will be exported. This channel is appropriate only for particles with animated particle ages such as those included in the Phoenix Particle Texture, PHXSource component Phoenix Source, and PHXFoam shader Particle Shader. In this case, the parameter will be animated not using the absolute global time, but the particles' age.

...

RGB – When enabled, the particle RGB channel will be exported. You can use this for simulations where you are mixing different particle colors or you shade the particles by the particle RGB channel through a PhoenixFDParticleTexturePhoenix Particle Texture. Also, enable this if you want to be able to preview the RGB channel as a particle color in the Viewport.

...