Sturdier than its reputation, but it rewards a light touch.

Hand wash cold, never dry clean. Cold water with a pH neutral silk detergent, no enzymes and no bleach. Swish gently and do not agitate.
Rinse and press, never wring. Rinse cold until it runs clear, lay flat on a clean towel and press gently. Twisting breaks the fibres.
Dry flat, out of direct sunlight. Reshape on a fresh towel and air dry. Sunlight yellows silk over time, and a dryer is never the answer.
Iron low, from the reverse. On the silk setting while slightly damp, always from the reverse side, with a press cloth.
Keep away from perfume and deodorant. Both stain silk permanently, so dress first and scent after.

The bottle for it

Made for this fibre, by a textile care specialist in Mönchengladbach.

For what this fibre is and where it is made, see Silk in Materials.