Definitions of tincture:

• noun:   (pharmacology) a medicine consisting of an extract in an alcohol solution
• noun:   a substances that colors metals
• noun:   a quality of a given color that differs slightly from a primary color
• noun:   an indication that something has been present

  Example: "A tincture of condescension"

• verb:   stain or tint with a color

  Example: "The leaves were tinctured with a bright red"

• verb:   fill, as with a certain quality

  Example: "The heavy traffic tinctures the air with carbon monoxide"