As mentioned in Part One, discharge inks are designed to work properly with cotton fibers and will give the best and brightest results onto 100% cotton shirts. 50/50, 65/35, CVC and Tri-blends can often have discharge inks printed onto them, but the results can vary drastically and it is best to understand the results or to speak with someone at Acme Prints who will be able to best prepare you for how it may print. Images of each point I touch on will be shown.
Certain color shirts are discharge’s enemy, such as a royal blue tee. A list of colors provided by Gildan grades how some colors discharge. This color chart applies to most other brands in a similar success ratio. Gildan’s chart is shown below and although they offer a ton of colors other companies do not, the tones cross over. So, a saturated blue or traffic light green color on other brands may have similar results.
Even when printing something as simple as white ink onto a 100% cotton kelly green American apparel tee, the ink may not end up bright white, but could have a slight greenish tone to the white. It does not look bad and can be used intentionally to create a certain look, but it is good to know what results can occur. Printing with discharge inks requires some flexibility and a concern for the success of the final printed product, as opposed to a tight restriction of a specific pantone color. Often with multi color discharge prints, dialing in the tonal balance and proper contrast between colors should outweigh the need for specific color accuracy.
Why does this happen and why do I need to be flexible? Mixing and creating discharge inks is a chemical process and the colors can shift from what the original looked like. When mixing plasti-charge inks (50% clear plasti-charge/ 50% of a specific plastisol ink) you are thinning out the amount of pigment and the color may lighten a bit. Once the ink has been printed, it removes the dye on the shirt and re-dyes natural cotton that has its own tone that varies slightly among brands, but falls into the light tan category. This mixing of the fibers and ink varies the color a bit too. How much variation? Well, it can range from a single pantone color, maybe a cool grey 8 looking a bit more like cool grey 7, to slightly larger shifts. This chemical reaction that affects the end result is why some flexibility is needed. If you really need a specific pantone because your company uses it on everything, discharge may not be the way to go. This by no means implies that you cannot do multi-color discharge prints. You can and to great success! Check out the George & Dragon example, which will also illustrate a 100% cotton print vs. a 50/50 of the same exact print.
Because the chemicals in discharge inks are designed to work with 100% cotton, printing onto a poly cotton blend will give much more subdued colors. The example shown of George & Dragon is the same exact print, same colors, printed one after the other. On the 100% cotton tee, the colors are bright and vibrant. On the 50/50 cotton/polyester blend, you can easily see how much darker the colors all are. The reason this happens is because the discharge ink is only re-dying the cotton portions of the garment, in this case, 50% of it. So, logically, the color will not be as bright. If a subtle print is what you are looking for, you can print onto a poly cotton blend. Again, flexibility is key in this situation. A white discharge print onto a 50/50 or 65/35 black tee will leave something that looks pretty dull and greyish, which may be exactly what you are trying to achieve as well. This would be a scenario where you can use the chemical reaction in your favor to get a look unattainable with standard inks, but it is always best to know what your end product may look like when doing this kind of print.
Asking one of the employees at Acme Prints to send an image of an example of a similar style or our experience with the specific color combo you want is always best. I use poly/cotton blends often with miles to go in order to obtain specific looks which help distinguish the vibe of my brand and tend to be subdued color palettes and de-saturated tones. In part 3 I will go over some advanced methods and show a chart of the pro’s and con’s of printing with discharge inks. 
Gildan color chart ( click to view full size)
