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
Lead 15th Anniversary Live Box the music industry, having debuted on July 31, 2002 with the song "Manatsu no Magic". The first DVD/Blu-ray featured the live performed to celebrate their anniversary, "Lead 15th Anniversary Live ～Kan Ima Shirube-sai～" (感今導祭 / "Guiding Emotions"), which the group held on July 29th and July 30th at the Maihama Amphitheater. The second disc held their fifteenth live tour "Lead Upturn 2017 ～This is Our Day～" - the performance which was performed at Cosmos Theater (Kaizuka City Civic Cultural Hall) in Kaizuka, Osaka on September 10th. Bonuses on both discs featured behind-the-scenes footage of both concerts and the collection of