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 DVD held their fifteenth live tour "Lead Upturn 2017 ～This is Our Day～". The live box charted at #59 on the Oricon DVD charts and #61 on the Blu-ray charts, remaining on the charts for one week. "Lead 15th Anniversary Live Box" is a DVD/Blu-ray two disc collection released by the Japanese hip-hop group Lead on December 20, 2017. It charted #59 on the Oricon DVD charts and #61 on the Oricon Blu-ray charts, where it remained on both for one week. The live box featured two separate performances spanning across two DVD/Blu-rays to celebrate the group's fifteenth anniversary in