even for a transparent vase, the glass material with the parameter "d" 0.1-0.2 looks more spectacular and elegant, not as is customary for glass 0.4-0.5. With a small number, a more clarified glass is obtained, it is more expensive than usual on sale)). And with average values, it is impossible to obtain glass of very light shades, but glass of dark shades (graphite or bronze) is obtained. Therefore, you can change the "d" for the tasks of the model.