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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