colorings dropped into the container, you can give the answer to this.
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Application of food coloring:
Wait for the tank to fully fill up.
Drip a few drops of liquid food coloring, blue or red, in the tank, not in the cup.
Do not pull it off, wait 10-15 minutes.
If the color appears in the cup, the container will leak. Then pull it down so the paint doesn’t touch anything.
If the cup remained clean after that, it is a good sign, but the slow or occasional leakage