Obsidian

Strong dark cobalt blue that holds its depth without thinning; work in a neutral flame and avoid reduction.

Outcomes

• Deep, saturated cobalt blue with strong color depth that does not thin out flame: NeutralBlueIndigo
  Work in a neutral flame for best results; the color holds its depth even in thin layers.
• Color degraded or compromised — undesirable result when reduced flame: ReducingBlueGray
  A reducing flame is explicitly advised against; avoid reduction to preserve the rich cobalt blue.

Working notes