maya blue

LITMaya blue is an organo-clay pigment made of indigo and the fibrous clay palygorskite. It was used in Mesoamerica from about the 8th to the 16th centuries, and its turquoise survives on stelae and codices, the Dresden Codex among them (see this site's Dresden screenfold). Heated together, the stable pigment forms between about 70 and 130 °C, as the clay loses its zeolitic water and indigo blocks the tunnel mouths (Sánchez del Río et al.). Maya blue resists acids, alkalis and solvents; palygorskite versions are far tougher than sepiolite ones (Archaeometry 48, 2006).

MODELIndigo molecules random-walk along clay tunnels. Above 70 °C water leaves and indigo can lodge at the mouths. The acid button attacks: unlodged indigo washes out, lodged indigo survives. Nesting: an orange copal-incense core, purple cochineal, green jade, yellow ochre, the blue, the void.

kiln °C acid bath

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