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[求助] 硅酸盐的鉴别反应原理

请问鉴别硅酸盐时为什么会产生这个现象
Mix the prescribed quantity of the substance to be examined
in a lead or platinum crucible by means of a copper wire with
about 10 mg of sodium fluoride R and a few drops of sulfuric
acid R to give a thin slurry. Cover the crucible with a thin,
transparent plate of plastic under which a drop of water R is
suspended and warm gently. Within a short time a white ring
is rapidly formed around the drop of water.
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