Some questions regarding the rebuilding of a small open fireplace I have. Some tiles were cracked and some were loose, so I took them all down.

I have taken down all the firebrick, one side is logically quite black, is it possible to turn them so the old backside faces outward when I put them back up? Or will the mortar adhere less if there is soot?

Should one prime anything before applying the mortar? Or is water enough?

Thanks in advance.

/Novice
 
This is how it looks now that I have just taken them down.
 
  • Dirty and damaged wall with broken plaster pieces scattered on the floor after removal.
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