It is nearly as soft as lead and softer than silver.
The many steel objects which need an extremely hard outer surface but a softer and more malleable interior may be carburized superficially by heating them in contact with charcoal or other carbonaceous matter, for instance for between 5 and 48 hours at a temperature of 800° to goo° C. This is known as " case hardening."
"I saw something, ikir," she said in a tone far softer and more respectful than her original.
"I told you I'd never hurt you," he said in a softer tone.
In this group the enamel extends partially to the back of the incisors, but in all the rest it is restricted to the front surface, so that, by the more rapid wearing-away of the softer structures behind, a chisel-shaped edge is maintained.