different between uneffaceable vs ineffaceable

English

un- +? effaceable

uneffaceable (comparative more uneffaceable, superlative most uneffaceable)

in- +? effaceable

ineffaceable (comparative more ineffaceable, superlative most ineffaceable)

Incapable of being effaced.
- 1865, Edward Dutton Cook, Sir Felix Foy, Bart. (page 233)
  Mr. Disbrowe was reclining on a well-worn horsehair-covered sofa, his frequent reclinings on which piece of furniture had stamped a deep and quite ineffaceable impression of his weighty form upon the cushion.

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