Medium and High Porosity Terracotta
Machine made terracotta is generally smooth in appearance with regular edges. Handmade terracotta normally has a rougher texture which is sometimes pitted, may be friable, imprecise in shape with edges that are distorted or frayed. Terracotta will readily scratch and stain when unsealed. Porosity Test: Up to 5 minutes. (Note: Reclaimed and old terracotta which may appear similar to high porosity terracotta will sometimes not properly absorb sealers.)