Grinding
Following the materials science processes of hardening and annealing, the blanks are hollow ground, according to one of the two fundamental blade profiles. At the highest end of hollow ground, more hollow than even the 1/1 grade, is the so called singing razor, so named because its blade produces a specific resonant tone when plucked, similar to a guitar string.[1][5] The singing razor blade at this excited stage is essentially a vibrating membrane. Its manufacturing process is so demanding that a full 25% of the blades get rejected as not meeting standards.[1] Thiers Issard does not produce flat ground (wedge) type blades.[1]
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