HI
Does the Ic pan need toughing the bottom of the bottle? Some bottles are concave so there is air in the center of the bottle.
Does the color of the glass help keep the IC longer ie brown glass vs clear?
Does a lid on the bottle reflect the sound waves back into the water?
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HI
Does the Ic pan need toughing the bottom of the bottle? Some bottles are concave so there is air in the center of the bottle.
Does the color of the glass help keep the IC longer ie brown glass vs clear?
Does a lid on the bottle reflect the sound waves back into the water?