Cigar ash

[1] Cigar ash may be mixed with chalk to make a dentifrice or tooth powder.

It may also be mixed with poppyseed oil to make paint in shades of grey.

An ashtray is used to dispose of ashes and butts without creating a fire hazard.

This expertise was used in his cases such as A Study in Scarlet, The Boscombe Valley Mystery and The Hound of the Baskervilles.

This is often used as an example of deduction or the Baconian method in philosophical accounts of science and reasoning.