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Grey-Black Cement

Fine iron dust, mixed as in No. 2182, gives a grey-black the bottle should be heated in a water bath to liquefy it; the fragments to be cemented should also be heated before joining them, cement. and, as a matter of course, the surfaces well cleaned. Glass, crockery, &c., restored by the above cement, are as solid as before hav- ceedingly hard, which, on polishing, exhibits ing been mended, and the seams are scarcely visible.