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And here's the same mouthpiece after 30 minutes immersed in white malt vinegar. You can quite clearly see that the scale deposits have gone. What you can also see is that the mouthpiece has taken on a dull greenish hue. This is due to the action of the vinegar on the Ebonite that the mouthpiece is constructed of.
Serous drainage is clear and may be slightly yellow or colorless in appearance. It is thin and watery and may make a bandage wet without leaving a stain of color. Serous exudate, or discharge, is normal from a wound in the early stages of healing, typically in the first 48-72 hours after the incision is made. While serous fluid is normal in small amounts, large amounts of this clear fluid leaving the incision line should be reported to the surgeon.