The glazed planters are high fired at 1000 degrees centigrade to ensure frost resistance and durability. We are also subjected to rigorous testing in freeze-thaw conditions to ensure quality. Due to the processes used in the manufacturing of our hand-made and hand-glazed containers, all variations with respect to firing, color, size, and crackling are not deemed to be defects but are natural occurrences in the manufacturing process. The glazes on our containers consist of natural, not chemical, components and therefore the final color of the product will vary. This process creates the unique beauty of each piece.