Yeah, Jacquard Procion MX Dye does need soda ash to work its magic, especially on natural fabrics like cotton, linen, and rayon.

Our research shows that the dye forms a strong bond with these types of fibers, which means you'll get those vibrant, long-lasting colors you want. But if you're working with synthetic or blended fabrics, your results might be hit-or-miss. For instance, polyester or spandex blends might not take the dye as well, unless the fabric is at least 50% natural fibers. We've definitely seen this pop up in feedback a lot.

To get the best color and durability, you'll want to do a soda ash pre-soak before you start dyeing. This step helps the dye stick better to the fabric, giving you brighter and more permanent colors.

So, if you want the best results, don't skip the soda ash—it's a game-changer!