'Silk' paints; and ethics

'Silk' painting....or, not actual silk; taffeta in fact. It lacks the vibrancy of painting on silk. The colours don't sing out as much. But I don't use silk as a fabric, as I try not to use any (obvious, at least!) killed animal by-products in my work. I realise this is a loaded issue, as I use oil paints and art materials which have most likely been tested on animals to 'ensure' their safety, and non-toxicity to humans. It's not an easy subject. The more I consider it, the more problematic it is! I just try my best; tiptoe-ing through all the ethical issues. The other students' work looked much better than this taffeta painted with silk-paints; the paint is designed to work best with silk, after all. I do keep a look-out for white/pale silk fabric in the second hand shops. Somehow it feel it might be alright to use second hand silk. But I don't buy it new; and in courses, I choose not to use it.