Table 6.

Space holders and solvents for water leaching.

Space holder material	Solvent	References
Carbamide	water, NaOH	[29,52,66,86]
Sodium chloride	water	[35,36,55]
Corn starch dextrin	water	[38]
Saccharose	water	[39]
Magnesium	HCl	[72]
Stainless steel	acetic acid	[43]