Best Heat Press Ink
For the best quality shirts and prints it's best to figure out which inks works best on your shirts for the prints. You want to make sure that the ink is best for washing. The ink needs to stay on the garment during the wash and wear and tear.
Dye Based Ink:
Dye based ink are water based inks. They are most likely to bleed when washed. This type of ink is used with inkjet printers and are considered very affordable. Though its is cheaper and has high quality image quality, it is not very durable for wear or stand washing.
Dye based inks are water soluble and start washing off in high humidity environments.
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Pigment Based Ink:
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Pigment inks are great for professional or beginner professional printers. Dye based inks are water soluble. Pigment inks are water insoluable and therefore is great in humid and wetter environmnet. The same things that makes pigment inks water insoluable also has some drawbacks. The inks colors are generally more muted or dull. But this can be overcome with careful application, media and other factors.

Sublimation Ink:
Sublimation ink is a dye that is printed onto specific items via heat and pressure. Heat and pressure will help convert the dye into a gas state without turning into a liquid.
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Sublimation ink is used with a specific type of printer. Sublimination is the process of transferring an image quickly and cleanly. You apply heat to the printed image with a press, through transfer paper or directly.
Toner Ink:
- Toner is not a good ink for heat press transfers. They are used with laser jet printers. Laser jet printers and toners are heat based that's why it can ruin heat transfer paper.
Related questions:
Why is my shirt faded after wash?
Shirts are faded because due to the lack of heat. If you follow the specific instructions on the terms of heat and duration.