Table 4.

Antibacterial activity of wool fabrics dyed with spent coffee extract at 90 °C as a function of dyeing time (all dying samples were mordanted with 1 wt % tannic acid aqueous solution except 90* sample).

Dyeing Time (min)	Reduction % of S. aureus	Reduction % of K. pneumoniae
Pristine wool	28.2	32.5
30	99.2	93.1
60	99.7	97.5
90	99.7	99.6
90 *	76.5	43.6
120	99.6	96.2

* Wool fabrics dyed with spent coffee extract but not mordanted.