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-2 BASIC LABORATORY TECHNIQUES T - NCERT

(v) Trim any jagged edge by striking with a wire gauge (Fig. 2.2 a). (vi) Heat the freshly cut edge of the tube gently in the flame to make the edges round and smooth (Fig. 2.2 b). This is called fire polishing. For fire polishing, first continuously warm the cut end in the Bunsen flame and then rotate it back and forth until the edge is rounded.

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