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Whilst you might think that you use Reflection Tint and Transmission Tint to create a physically accurate colored glass, you'd be mistaken.  Those two controls are there to be used subtly to adjust your tint(s) to match your reference material.

The correct way is to set your glass color with Absorption Color and then tweak Absorption Radius to control how much light is absorbed.  In the example above, our teapot mimics the size of the real-world RenderMan Walking Teapot, standing big teapot stands tall at 20cm and therefore the Absorption Radius was set to 0.02. 

Materials X Lama and the parameters are there for you to have ultimate control over your material and so feel free to adjust your settings to match your desired look and reference images

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