为了避免稀释造成的微粒变化，胶乳制造者总是希望在高浓度溶液中进行精确测量。
Accurate measurement in highly concentrated solutions has always been a desire of latex manufacturers because of concerns about particulate changes arising during dilution.
如果波美浓度太低，则可加入高浓度的三氯化铁溶液。
If Baume concentration is too low, you can add high concentrations of ferric chloride solution.
强浸蚀：将金属制件浸在较高浓度和一定温度的浸蚀溶液中，以除去金属制件表面上氧化物和锈蚀物的过程。
Strong erosion: the metal workpieces dip in with high and certain temperature erosion of solution, to remove metal workpieces surface oxides and corrosion things process.
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