The plain white tapa strip, which has been through previous water baths and perhaps even a bleach treatment, has shown me only orange rust stains. However, the two pre-dyed tapa strips reward me with a remarkable result when I return the next day.
My theory was correct: the pre-dyed pieces of tapa show black stains after the chemical reaction between the tannin-rich plant dye and the iron oxide. I can’t figure out how the brass-coloured stains come about, but it’s the black I’m after at this stage. It makes me wonder what would happen, if I tied a piece of Banyan (Ficus prolixa, on Atiu called ava) around my magic rusty rod.
Beaten Banyan bark naturally turns a rich orange brown. Two fermented pieces have been joined together by beating. Perhaps this kind of tapa still contains enough tannin to react with the iron oxide?
Together with two square pieces of lace-like Paper Mulberry barkcloth, I have brought a sample from last year’s tapa making workshop at Enuamanu School. Now I have two questions: Will the joined seam stick together after soaking the bark in sea water? And will the contact with rust produce black stains? I will find out next time I visit the Edna at Ava Tapu Beach…