It is nearly as soft as lead and softer than silver.
"Are you okay?" he asked in a softer tone.
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.