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Scratches on mirror?
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<blockquote data-quote="Marguerite" data-source="post: 435434" data-attributes="member: 1991"><p>They look like scratches to me. There appear to be two different things that have been used. One is pointed, the other is not. A drill bit could do this; a knife; anything made of steel, in fact. I recall from my studies in Geology, that glass has hardness of 7 and can be easily scratched by anything harder. We used to use a penknife to test for hardness 7, or a ceramic tile. Hardness 7 and higher would scratch the tile.</p><p></p><p>My bet is that he's found the stash of drill bits or similar, and was testing them to see what sort of marks they would make. Then it became obsessive (as it so often can with our kids). And he doesn't really understand why he has done this, and therefore is being secretive about it and in denial.</p><p></p><p>ANd I know I'm stating the obvious, but the apparent double image effect with the scratches are NOT the precision markings, it is simply the reflection of the scratches from the reflective coating at the BACK of the mirror. The apparent distance between the 'double' markings are the thickness of the glass.</p><p></p><p>Marg</p></blockquote><p></p>
[QUOTE="Marguerite, post: 435434, member: 1991"] They look like scratches to me. There appear to be two different things that have been used. One is pointed, the other is not. A drill bit could do this; a knife; anything made of steel, in fact. I recall from my studies in Geology, that glass has hardness of 7 and can be easily scratched by anything harder. We used to use a penknife to test for hardness 7, or a ceramic tile. Hardness 7 and higher would scratch the tile. My bet is that he's found the stash of drill bits or similar, and was testing them to see what sort of marks they would make. Then it became obsessive (as it so often can with our kids). And he doesn't really understand why he has done this, and therefore is being secretive about it and in denial. ANd I know I'm stating the obvious, but the apparent double image effect with the scratches are NOT the precision markings, it is simply the reflection of the scratches from the reflective coating at the BACK of the mirror. The apparent distance between the 'double' markings are the thickness of the glass. Marg [/QUOTE]
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