Washing

Wash your silk piece only in cold water, with Marseille soap and by hand. 

Spreading

Dry your silk flat, avoiding extreme temperatures (e.g. a window in direct sunlight).
NB: Never put in the dryer.

Ironing

Set your iron to a silk temperature (120-130°C). Use a dampened cotton cloth between your piece and the soleplate of your iron to protect the silk and avoid shining or burning.