A hollow compact has a partition partitioning it into a first interior compartment sealed apart from a second interior compartment. The first compartment is charged with a first solvent, the second compartment with a second solvent. The solubility properties of the first and second solvent are chosen such that neither risks attacking and/or dissolving the compact. Conversely, the solubility properties of the first and second solvent are otherwise chosen such that the mixture of the two indeed possesses an independent set of solubility properties, whereby the mixture is indeed capable of attacking and dissolving the material of the compact. Wherein, breaching the partition allows the charges of the first and second solvents to mix and thereby form the mixture therebetween. That way, the compact might vanish by dissolving into the mixture solvent or else might more likely might dissolve into a nearly un-recognizable form of its former self.