On a linen one, the color ran.
Silk ties (my experience) either don't unwrinkle, lose their shape/loft and wither or pucker, and I've tried to just gently dampen/heat areas with spots to I could rub/brush them out and it was either ineffective or damaging.
MAybe others here with more skillz can use it more effectively but I've ruint at least 4 ties with my experiments.
I use one of these babies:
Manufactured circa 1955 and still going strong. I bought mine at a car boot sale for £1, they sometimes appear on eBay for next to nothing but be warned, they are 220-240 volts