These would melt during firing and harden. After several days, they harden and darken to resemble those of an adult pangolin. Bricks were sun baked to harden them. The secondary walls harden the cells and make them impermeable to water. Exposed to air the hard ground will harden. The bones harden into stones and are preserved as fossils. These clasts must have been heated to to harden. The clay would harden, thus securing the contents of the document. He mixed sugar into the paste to harden its consistency. Their quills harden soon after birth. William Hurt, Timothy Olyphant and Marcia Gay Harden joined the regular cast. Marcia Gay Harden and Toby Jones joined the cast later in the month. The role was recast with Marcia Gay Harden. New growth may be insufficient or fail to harden off affecting winter survival. Jared Padalecki plays Kinkade and Marcia Gay Harden plays his mother.