Dear Jocelyn, What a wonderful heirloom, I would strongly advice do absolutely nothing (apart from keeping your sampler out of the light) until you can consult a properly qualified fabric conservator. Sorry to sound edgy but I have seen so many things damaged with in expert attention I jointly lead a local Family History Group and as part of our 2006 programme we are visiting the Conservation Laboratories attached to our County Archives. I've no idea of the Australian structure, but I am sure any major museum or archive, will point you in the right direction. it would be interesting to hear how you get on. Good luck Lesley Pinchbeck