I have been doing some tea dyeing with all kinds of ordinary tea and fruit tea. I kept all the foil sochets that the fruit teas come in coz they are really bright beautiful colours. I thought being foil I would be able to stitch them in with fabric. They stitched very well BUT when I pressed the first one, it shrivelled up. Damn. Who knew they had a lining of plastic inside the foil? It looked just like thick foil. I only tried with the lovely green ones that the peppermint teabags came in. So I ironed all the remaining green sachets to shrivel them too. Don't know what I'll do with them yet. Maybe when I find them again in a couple of years I'll just throw them out LOL.