Meanings of black sealing in English

It was mounted with deep mourning, and heavily sealed with black sealing wax.

Fragments of black sealing-wax adhered to the coin!

A stick of black sealing-wax and seal were there too, as if the ordinary fastening had not been considered sufficiently secure.

But the fact is that it resembles the wax of black sealing-wax, which surrounds and insulates the particles of conducting carbon, interspersed throughout its mass.

'From the day of her death to that of his own,' writes a biographer, 'he wore mourning, and always used black sealing-wax.