Lookie lookie. I found this violet glutenous rice (locally known as pirurutong) at the supermarket today, very very rare. I almost thought that pirurutong was a myth and thought that no one's growing them anymore (you can't see it in the picture but the label says that the pirurutong is grown locally!). It's what traditional Puto Bumbong is made of, not the regular glutenous rice dyed purple to mimic the original.
If they only sold the Puto Bumbong steamer with it and a copy of the recipe on the package, people would be lining up to buy them. I would be one of them. Hubby loves Puto Bumbong (pictured below), almost as much as he does me. He he he :-)
Purple Glutenous Rice available at Shopwise for P177.75 for a pack of 2 kilos.