The difference between Blacken and Taint

When used as verbs, blacken means to cause to be or become black, whereas taint means to or (something) with an external , either or .

Taint is also noun with the meaning: a , or , especially in.

check bellow for the other definitions of Blacken and Taint

Blacken as a verb (transitive):

To cause to be or become black.
Blacken as a verb (intransitive):

To become black.

Examples:

"The sky blackened as the storm clouds rolled in."
Blacken as a verb:

To make dirty.
Blacken as a verb:

To defame or sully.

Examples:

"Malice delights to blacken the characters of prominent men.'' — Napoleon Bonaparte"
Blacken as a verb:

To cook (meat or fish) by coating with pepper, etc., and quickly searing in a hot pan.

Taint as a verb (transitive):

To or (something) with an external , either or .
Taint as a verb (transitive):

To (food) by .
Taint as a verb (intransitive):

To be infected or corrupted; to be touched by something corrupting.
Taint as a verb (intransitive):

To be affected with incipient putrefaction.

Examples:

"Meat soon taints in warm weather."
Taint as a verb (transitive, computing, programming):

To mark (a variable) as unsafe, so that operations involving it are subject to additional security checks.
Taint as a verb (transitive, AU, finance):

To invalidate (a share capital account) by transferring profits into it.

Taint as a noun:

A with a , which fails of its intended .
Taint as a noun:

An done to a in an encounter, without its being broken; also, a breaking of a lance in an encounter in a or unscientific manner.

Taint as a verb (transitive):

To damage, as a lance, without breaking it; also, to break, as a lance, but usually in an unknightly or unscientific manner.
Taint as a verb (transitive):

To hit or touch lightly, in tilting.
Taint as a verb (intransitive):

To thrust ineffectually with a lance.