The first day of school in the China falls on 1 September, or the first Monday following if September 1 is a Friday, Saturday, or Sunday. In northeastern China, schools open on Monday in mid-August after summer vacation.
3) Improper heating profiles setting lead to unbalanced heating zones temperature inside heating furnace, which causes uneven glass temperature on both different parts of the glass sheet and between the top and bottom glass surfaces, thus may brings irregular white haze on glass surfaces.
The cost of the frames can also add to the value. It is important to care for glasses and clean them correctly when they get saline water spots on them. Besides being annoying, saline spots can cause damage to the eye glass lenses and frames. Regardless of how salt water spots end up on eye glasses, the result of the accidental spill can dry into a crusty white residue. This is actually salt crystals forming.