With that said - if you have a one-off cotton or dark shirt, you don't have to take sublimation completely off the table. There's a workaround, and it produces results that look really good.
But first, it helps to understand why the limitation with sublimation exists in the first place.
Why Sublimation Normally Requires Light Polyester
Sublimation ink works by converting from a solid to a gas under heat and bonding directly with polyester fibers. Two things have to be true for this to work: the fabric needs to be at least 65% polyester (the lower the count the less vibrant the colors), and it needs to be light colored since sublimation printers don't print white ink (no base color).
Sublimation ink is essentially transparent — it tints the fibers rather than sitting on top of them, which means a dark fabric will swallow the colors entirely, and cotton fibers simply don't bond with sublimation ink at all.
This is why sublimation looks so crisp and vibrant on a white polyester shirt and washes out on a gray shirt and is essentially invisible on a black one.
The Workaround: White Glitter or Flock HTV as a Base
The fix is to create a polyester surface on top of the dark or cotton fabric — and that's exactly what white glitter HTV and white flock HTV do. Both heat transfer materials contain poly fibers in the material itself, which means sublimation ink can bond to then.
Then it doesn't matter what color of fabric the shirt or garment is that the HTV transfer is applied to. It could be 100% polyester and you can use your sublimation transfer!
The process involves two separate materials that need to line up precisely: you cut the HTV to match your design and press it onto the shirt first, then sublimate your printed design directly on top of the HTV layer.
The result is a vibrant, full-color sublimation transfer on a fabric that normally wouldn't work at all.
This Is an Advanced Technique
It's worth being upfront: this is not a beginner project and it is a work around. It's also time consuming and therefore not ideal if you're looking for a long term or wide scale solution for decorating darks or cottons.Because you're working with two separate materials that need to align perfectly on the shirt, it requires you're comfortable and familiar with both sublimation printing and cutting HTV and using Silhouette Studio to correctly design both parts of the transfers.
The full step-by-step process — from setting up the file in Silhouette Studio through the two-press heat application — is covered in this month's free video of the month on Silhouette U. Anyone can watch the full video without being a member.
The video will walk you through the entire workflow from design setup to finished shirt so you can see exactly how the layers come together before you try it yourself.
Ready to learn how to sublimate on darks and cotton? Click here or enter your email below and we'll send it right to you.
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