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ceramic tile installed on black sticky substance under peal and stick

last month

in a bathroom we removed peal and stick tile from 10 years back and the subfloor is covered in black sticky substance. We can see that a linoleum floor was there before the sticky tiles and this could have been glued down with the sticky substance. Can we put mortar and tiles directly on top of the sticky substance. It is black but not mold. None on the baseboards or walls. All clean other than the subfloor. Any thoughts are appreciated.

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