Tin pest related problems such as tin whiskers. At 13.2 °C (about 56 °F) and below, pure tin transforms from the silvery, ductile metallic allotrope of β-form "white tin" to the brittle, nonmetallic, α-form "grey tin" with a diamond cubic structure. The transformation is slow to initiate due to a high activation energy but the presence of germanium (or crystal structures of similar form and size) or very low temperatures of roughly −30 °C aids the initiation. There is also a large volume increase of about 27% associated with the phase change to the nonmetallic low temperature allotrope. This frequently makes tin
Wedding dress of Princess Mary of Teck (although "The Times" reported there was none) and the veil of her mother's which she wore was also made of Honiton lace, fastened by diamond pins given as a gift from Queen Victoria. Matching the orange blossom elements to the dress, small wreaths were placed all the way around the bust and on the hair. Princess Mary completed the wedding outfit with a diamond tiara from Queen Victoria; diamond rivière necklace from the Prince and Princess of Wales and diamond earrings and anchor brooch, a wedding gift from Prince George. Out of all of the wedding toilette, the veil was