Noriko came back to classes after a five month visit to her hometown in north Japan. She headed straight to the indigo and started to dye the homework that had piled up over her absence.
Cloth comes out green when dipped in indigo. It turns blue in less than a minute as the broken indigo pigment sugar picks up an additional oxygen molecule in the air outside the vat.
I love those fugitive, ephemeral greens that appear upon removing the item from the vat, and watching it turn gradually blue.
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