  A deposited drop of bovine serum albumin salt solution experiences both
gelation and fracturation during evaporation. The cracks appearing at the edge
of the gelling drop are regularly spaced, due to the competition between the
evaporation-induced and relaxation-induced stress evolution. Subsequently, the
mean crack spacing evolves in an unexpected way, being inversely proportional
instead of proportional to the deposit thickness. This evolution has been
ascribed to the change with time of the average shrinkage stress, the crack
patterning being purely elastic instead of evaporation-controlled.
