Very nice attempts from both of you to obtain either small 3D models or very nice renderings with a row of bottles [:)]
For your information, you should know that the [font=courier new]Ni[/font] factor in MTL files is used as the optical density (see MTL specs here). If glass has an optical density of 1.5 like Cec used it, other materials have often a different value like water which optical density is 1.333. It would be interesting to test that if some of you have the patience.