Passivation with nitric acid is required after an oxalic acid rinse.
用草酸冲洗后，必须要用硝酸钝化。
The cleaning technology was hydrochloric acid cleaning, citric acid rinse, peroxide passivation.
清洗工艺为盐酸酸洗、柠檬酸漂洗、双氧水钝化。
Rinse after a few minutes, because long-term exposure to the acid in the lemon can harm tooth enamel.
几分钟之后用清水漱口，因为长期接触柠檬酸对牙釉质有伤害。
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