合适的波美浓度是38到40度之间。

The appropriate concentration of 38-40 Baume degrees.

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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.

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它的波美浓度在蚀刻环节中非常重要，直接影响到蚀刻的速度。

It's part of Baume concentration is very important in the etching, a direct impact on the speed of etching.

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