Message: Hello I would like to know if it is possible to dye a 65% acetate mixed with 35% rayon dry clean only dress? I want to do an ombre effect on it. The dress is cream colored with little rust stain spots. Thanks!

No, sorry, you can't dye anything that is not washable.

In some cases you can machine-wash a dress even if it is marked "dry clean only". If it survives the washing, you can then consider dyeing it. 

However, acetate is not a good fiber to try to dye at home. It often gives uneven, splotchy results, and it requires stovetop boiling and special dyes for best results. You can try dyeing it in the washing machine with all-purpose dye, but the results are unlikely to be worth wearing. It's not worth the time, trouble, and expense.

If you want to dye an ombre effect on a dress, I strongly recommend you buy a dyeable white dress blank, such as those that Dharma Trading Company sells. It will give you much better results, and often for a very reasonable price.

Dyeing color gradients is more difficult than other sorts of dyeing. See "dyeing single color with gradual fading effect" and "Questions about ombre / gradation dyeing long piece of fabric...". I do not recommend ombre dyeing for beginning dyers; it's a technique more suitable for people with considerable experience in hand dyeing.

(Please help support this web site. Thank you.)