Acces the secondary colors in the shaders.

Hi, I am trying to make an object that changes color over time. However I only seem to be able to access the materials main color. I can't acces the specular color. Or in the case I am working on, I am trying to access the tint color in the Particle/Addative shader. Does anybody know how you can access these?

The code I am using now is javascrip.

if (LI.intensity > 1){ LI.intensity = LI.intensity - 0.6; renderer.material.color = renderer.material.color - Vector4(0,0,0,0.1); print(renderer.material.color); }