Mezotintoing or Mezzotintoing: How To spell?

The word Mezotintoing is misspelled against Mezzotintoing, which is present continuous of "Mezzotinto"

Mezzotintoing has double "zz" is mispronounced as "z"
Remember double 'ZZ' in between the strings me & otintoing which should not be misspelled with single 'Z'
Wrong Spelling:  me-z-otintoing 
Correct Spelling:  me-zz-otintoing 
Find more incorrect spellings of Mezzotintoing to spell right way.

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