tainture

Perhaps taint +‎ -ure; perhaps from Middle French tainture (“dye; dyeing; tincture”). Doublet of tincture.[1]

tainture (plural taintures)

1. (obsolete) Dirtiness; uncleanliness; contamination, tainting.
   • c. 1590,, William Shakespeare, Henry VI, Part 2, Act II, Scene 1,

     Gloucester, see here the tainture of thy nest,
     And look thyself be faultless, thou wert best.

   • 1637, Joseph Hall, The Remedy of Prophanenesse, or, Of the True Sight and Feare of the Almighty, London: Nathanael Butter, Book 1, Section 11, p. 83,

     But, woe is me, other creatures are fraile too, none but man is sinfull; our soule is not more excellent, than this tainture of it, is odious, and deadly […]

   • c. 1647, John Fletcher, The Humorous Lieutenant, London: H.N., 1697, Act III, Scene 6, p. 37,

     Dem[etrius]. Now Princes, your demands?

     Sel[eucus]. Peace, if it may be

     Without the too much tainture of our honour:

• nutriate, turanite, unattire