Effervescing

ppl. a. [f. EFFERVESCE + -ING².] That effervesces; lit. and fig.

1793.  T. Beddoes, Consumpt., 128. Effervescing mixture of chalk and vinegar.

1837.  Carlyle, Fr. Rev., III. I. vi. He … was … conducted along the streets, amid effervescing multitudes.

1858.  J. G. Holland, Titcomb’s Lett., vi. 222. Life’s first effervescing hopes.