Efervesced or Effervesced: How To spell?

The word Efervesced is misspelled against Effervesced, which is past tense of "Effervesce"

Effervesced has double "ff" is mispronounced as "f"
Remember double 'FF' in between the strings E & ervesced which should not be misspelled with single 'F'
Wrong Spelling:  E-f-ervesced 
Correct Spelling:  E-ff-ervesced 
Explore spell check of Effervesced to spell without errors.

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