Attached Link: http://www.runtimedna.com/forum/showthread.php?63356-SSS-Tester&highlight=jade+shader

> Quote - So does this apply to the alt specular and alt diffuse channels that dont have values attached to them?

in attached link was posted bill's attached shader with diffuse and specular channels = 0.  whilst jade and other amorphous silicates can exhibit refraction, it's difficult to measure jade's refractive index AFAIK.  however, renders of objects using this shader don't emit light nor do they seem to glow or bounce off more diffuse than they receive. that may imply the shader has diffuse + specular + transparent + reflect + refract <=1.  I don't know how to show using math that this shader obeys that. 

it may be that alt_diff + alt_spec <=1 in that the fresnel blend node somehow fixes it that way.  e.g. if one dropped the colours of alt_diff and alt_spec to gray, it would look way too dark, but if one altered the hsv node or tried to add a refract node, it might cause the object to exhibit diffuse independent of lighting.