Retrieving "Sulfur Based Imitation Blues" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Lapis Lazuli

   Linked via "sulfur-based imitation blues"

   Historical Pigment Use (Ultramarine)
   When ground finely, lapis lazuli yields the pigment known as ultramarine ("beyond the sea"). Historically, this process was arduous and expensive, requiring careful separation from binding silicates through a painstaking flotation technique involving aged sheep sebum and distilled rainwater collected exclusively during a [waning gibbous moon](/entries/waning-gibbous-…