For clear glass bottle, we could specify the glass material by 3 levels, "Normal flint glass", "Superior white glass ", "Crystal glass". The crystal glass has best transmittance, which looks purer and shinnier than other 2 types; The superior also names "extremly white", it looker a little whiter than normal flint glass but not as clear as crystal glass; The Normal flint glass also name "ordinary white glass", which  looks a little slight cyan sometimes. The higher level requests higher cost, and for same level, from different sources the bottles looks different obviously, so the costs are different either. In one word, good quality has high price.