Sure. The Reflection_Value and Refraction_Value are multipliers of the amount of reflected or refracted light. These should not be so high as you have them. The Reflection_Value=4 means to reflect 4 times the light that is reaching the surface. Of course this does not look real, but can be fun for strange effects - as you can see.

(I think you missed the period? I was using .4 and .5, not 4 and 5.)

In real life, the maximum amount of reflection or refraction is 1. And, in fact, the sum of these can never be more than 1. If a photon reaches the surface, it can reflect, or refract, but not do both. These values, Reflection_Value and Refraction_Value, define the probability of what a photon will do. The photon can reflect or refract and you can adjust these probabilities, but they should never exceed one.

Actually, the full rule for physical correctness is this:

Diffuse_Value + Reflection_Value + Refraction_Value <= 1

At the time I posted this, I did not fully understand the rule, and I made a mistake myself. My first material uses .4 and .9, with a sum of 1.3. This is wrong, and is why the first glass looks funny.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)