A rainy day in between prevents me from returning after 24 hours and gives my experiment some more time to show results.
Wow! I have not expected such amazing confirmation of my theory that the reaction of tannin with the iron oxide, which is possibly contained in Banyan barkcloth, will produce black discolouration.
Not only am I rewarded with deep black rust stains, even a pattern has formed where the strings have pressed the bark firmly against Edna’s magic rusty rod. This now makes me wonder what would happen, if I wound a freshly beaten strip around the magic rod? I still have some unbeaten bark in the freezer which I will use for that next experiment. How exciting! Watch this space…
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…
Now that I have a better idea which parts of the Edna will help me harvest successful rust prints, I feel brave enough to experiment with some samples of tapa (barkcloth). They are left-overs from previous projects. White cloth from Paper Mulberry bark (Broussonetia papyrifera, locally called aute) is precious for me, because it has been extinct on Atiu and I have only just recently planted three seedlings which I got from Rarotonga. They are not yet tall enough to use. My sample pieces have been produced in Samoa and Tonga.
One is a leftover from my Third Space installation. Parts of it are filled with machine-sewn lace.
A long white strip seems ideal to wind around my rusty rod.
When I return the next day, I’m rewarded with lovely orange stains.
Even the Polyester thread in the lace has taken on colour.
The first two tapa strips seen in the image on top were used in a previous eco-dye experiment. They clearly show the resist marks and brown dye. I’ve been wondering what will happen to those pre-dyed strips which have not been rinsed after dyeing. Will they still contain the dye’s magic? Will the tannin in the eucalyptus dye react with the rust? My guess is that this should produce black stains. After I have taken off my nicely rusted white tapa strip, I apply the two dyed pieces to my rusty rod. Now I will have to be patient for a day or so…