1. Get your fabric wet with white vinegar.
2. Wrap it up around or spread it out on rusting objects. (the rust will bleed from one side of fabric to the other)
3. Cover with plastic for 2 or 3 days. Silk is more fragile and needs less time unless you like the holes created. “It’s all good”
4. Pack with sand if you want more surface contact between fabric and rusted objects.
5. Hang dry
Overdye if you like. Rust will take on some colour but will retain its own integrity