There are many manufacturer of glass in China and in the world. We have the same or similar standard with manufacturing float glass sheet . The thickness is from 2.0mm, 3.0mm, 3.2mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 15mm, 19mm, maybe little manufacturer can produce 22mm thickness.
Because the parameters of each home are different, and the materials, time, equipment and so on are different, the original films they produce are obviously different in color.
The biggest manufacturer from China is Xinyi Glass, Nanbo Glass , TaiWan Glass, Qibin Glass.....So,if your customers will order the color printed/painted glass, please do pay attention as making the sample, write down the glass sheet is from which manufacturer. Also in frosted glass , sandblast glass.
That is for clear float Glass. It will be the same with extra white glass . The best extra white glass from China is Jinjing. Its extra white glass is better than Xinyi or Nanbo or Hainan Extra white glass. The price is higher than others.