31c8a530_ANCES___A_REVIEW___PharmaTutor__Definition
[Sr. No.] 3 [Tablet Defect] Cratering [Reason] The coating solution penetrates the surface of the tablet, often at the crown where the surface is more porous, causing localized disintegration of the core and disruption of the coating. [Remedies] Use efficient and optimum drying conditions. Increase viscosity of coating solution to decrease spray application rate [Definition] 
Volcanic-like craters appears exposing the tablet surface
COATING TECHNOLOGY AND ITS RECENT ADVANCES – A REVIEW | PharmaTutor
Definition