And this is what ‘effloresce’ means.

ef·flo·resce /ˌɛfləˈrɛs/

–verb (used without object),resced, –resc·ing.
1. to burst into bloom; blossom. 
2. Chemistry. a. to change either throughout or on the surface to a mealy or powdery substance upon exposure to air, as a crystalline substance through loss of water of crystallization. 
b. to become incrusted or covered with crystals of salt or the like through evaporation or chemical change. 
[Origin: 1765–75; < L efflōréscere to blossom out, equiv. to ef- ef- + flōréscere to begin to bloom (flōr(i)-, s. of flōs flower + –éscere -esce)]