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I read a post somewhere recommending a certain way to remove some kind of residue, but the post said it would only work for (at least) "semi-vitreous surfaces".

So, glass would fall under this category. But what else? What kind of surfaces/materials do people mean when they use this term?

A dictionary does not help much.

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    "Vitreous" means "glass-like". Presumably "semi-vitreous" means something almost as smooth, pore-free, and non-absorbent as glass. It's a judgement call on your part. – Hot Licks May 15 at 19:19
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When specifying porcelain for tiles or work surfaces, one can have, in ascending order of porosity, non-vitreous, which holds the most water, semi-vitreous (in the middle), and impervious, which holds little or no water. In view of the stain-removal context, I would interpret "at least semi-vitreous" to mean "semi vitreous or impervious".

  • So, glass is impervious? – einpoklum May 15 at 19:49
  • Have you checked the meaning of 'impervious' in a dictionary? Have you ever seen glass soak up water? – Michael Harvey May 15 at 20:28
  • Yes and No, just wanted to make sure, because you would expect glass to be in a "vitreous" as opposed to "semi-vitreous" category. – einpoklum May 15 at 20:43
  • Of course glass is in a "vitreous category". That's what 'vitreous' means. Of all the things that can be glass-like, chief among them is.... glass! – Michael Harvey May 15 at 21:44
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As you say Vitreous means glass. A fusion of Alumina amd Silica with a metallic Oxide which affects the temperature of the melting point and the colour.

Glazed tiles are fired at a temperature which fuses the body of the tile (mostly alumina) with silicates and white, clear or coloured oxides.

The same fusion produces a glassy surface on china and pottery.

Enameled jugs and bowls are also covered in aluminium-silicates (English spelling here).

So, Michael Harvey has given you the technical meaning, I hope this gives the inenter image description hereformation to interpret the instructions.

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