the fun with turmeric continues - dyeing & SCIENCE!???!

     i had posted that i had inadvertently discovered that turmeric mixed with washing soda turns a bright red colour!  i had done a little experiment to figure it out by rubbing a piece of wet cloth with turmeric and then sprinkling it with washing soda on the left, baking soda in the middle and alum on the right.  (i did this because i had originally discovered this when i sprinkled it on some cloth that i had previously sprinkled all 3 and didnt know which one had caused the colour change)

     the washing soda turned bright red instantly!  the baking soda had a slight colour change after a few min, and the alum did nothing.
     well, i left the house and when i came back i was surprised to find that where the baking soda had been was now also very red!  i didnt have my camera with me at that time so i was not able to get a picture until the next day when the fabric had fully dried and the colours had faded a bit at that time.

   interesting!  but that's not all!  i was doing another spice dye experiment and in this one i also was sprinkling spices and i used the washing soda and baking soda and the turmeric, i also used some salt and some rusted metal and decided to try spraying some diluted apple cider vinegar mix on the whole thing at the end.  WELL!  look here:

     where the apple cider vinegar hit the turmeric it turned BRIGHT yellow!  obviously turmeric is highly colour sensitive to pH!  so interesting! 
     i wonder why i have not heard about this more????  if anything it's a fun experiment!