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stone chips
A boiling chip, boiling stone, porous bit anti-bumping granule is a tiny, unevenly shaped piece of substance added to liquids to make them boil more calmly. Boiling chips are frequently employed in distillation and heating. When a liquid becomes superheated, a speck of dust or a stirring rod can cause violent flash boiling. Boiling chips provide nucleation sites so the liquid boils smoothly without becoming superheated or bumping.
So,
I have washed my car, by hand, quite a few times since I got it (Sept 23) and I can't say I have ever noticed this.........
I only noticed it today when checking for stone chips.
As I looked round it, the active flaps were only just closing and I saw the gap.
On closer inspection I think...
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