Everything below is drawn from real conversations between working printers on The Shirt Board, 2011–2022. Source threads are linked throughout — the arguments are worth reading in full. TBT: Discharge Printing: What a Decade of Shop Talk Actually Teaches

Discharge gives you the softest print you can put on a dark garment — and in exchange it asks you to manage chemistry, humidity, garment dye lots, and a smell nobody forgets. Printers on The Shirt Board spent years hashing out what actually works. Here’s what the collective wisdom says.

The garment decides before you do

The single most repeated lesson in the archive: dischargeability lives in the shirt, not the ink bucket. When Shawn at Endless Ink printed the same job on Gildan 5000s and American Apparel blanks, the Gildans discharged noticeably brighter — and the thread that followed turned into a roll call of experience. “Gildan shirts discharge much better than AA shirts in general,” Evo confirmed, while jsheridan gave up on AA entirely and switched to Anvil 779s (“they discharge great and have tear-away tags”). Fluid put it best: “Every brand T’s dye reacts differently to the various discharge bases out there. Finding the right mix of discharge brand and t-shirt brand is the hardest part of the R&D. Once you got it, it’s smooth sailing.”

And even then, it isn’t. Evo again: “I have run into weird batches of shirts where the dye is just stubborn. Sometimes even just a half dozen or so in a box.” Test the actual garments for the actual job, not the brand, the box.

Soft hand is the point, and clear base is the proof

That same thread contains a detail worth stealing: Shawn’s customer wanted zero print feel, so he skipped white discharge base entirely and printed clear discharge base alone — one hit through a 110 mesh — and got a surprisingly bright, essentially hand-free print. Veterans in the thread suggested going further: a 150/48 “S” thread mesh, with more open area and better detail retention than a standard 110, is the community’s go-to recommendation for discharge.

Why discharge prints fade — and how to make them stop

The most technically valuable thread in the corpus may be “What causes discharge ink to fade on a shirt?” — where Rob, a 25-year Wilflex veteran, answered from the manufacturer’s side. Two mechanisms cover almost every faded print:

1. The water never fully left. A print can look discharged without being cured. “Most H2O companies recommend 330°F for two full minutes. Forced hot air with good air flow,” Rob wrote. As he put it in a separate cost thread: “Many times the print will fully discharge without being fully cured, thus the product will not be washfast.” He compiled manufacturer cure specs there.

Minutes, not seconds. Shops with short infrared dryers are fighting physics. Slow the belt down; brandon’s blunt diagnosis of most fading: “Too many shops run the dryer too fast for this type of ink.”

2. Not enough binder for the pigment. The binder in the base is what holds pigment to the shirt, and over-pigmenting a base spreads it too thin — the pigment eventually just “lets go” in the wash. Rob’s advice: use strong pigments so you can use less of them, and if you must thin the ink, don’t add straight water — mix binder and water 50/50 and thin with that. Belt-and-suspenders printers like screenprintguy add a fixer to every mix: “I got into the habit of adding Matsui’s Fixer N to every discharge or water-based mix… we never have a print fade.”

The underbase flash war

Printing plastisol over a discharge underbase gives (in ZooCity’s words) “so much softer, smoother, better blends — no comparison” versus a plastisol base. The eternal question is whether to flash that base first, and a 32-post thread argued it out. The consensus that emerged: flash, but barely — two or three seconds, just enough to drive out moisture. You aren’t trying to saturate the garment like a full discharge print, just bleach the surface so the top colors pop. The cautionary tale for wet-on-wet came from ZooCity’s own press: wet discharge base slowly clogged his 330-mesh CMYK screens mid-run, shifting skin tones “from tan to sunburnt for 30 shirts… then from sunburnt to pallid.” If you do run wet-on-wet, ebscreen’s trick: put the color screen immediately after the base screen — discharge base that’s had time to tack up air-dries into trouble.

Pot life: the clock starts at activation

Once you stir in activator, you’re on the clock — but the clock is more forgiving than the datasheets imply. In a thread on saving activated ink, printers converged on the practical rules: whites and non-critical colors can be revived the next day (top the surface with a mist of distilled water, seal tight, re-add a reduced dose of activator and test), but Pantone-critical colors should be remixed — and reds are the first pigments to degrade after activation. Mimosatexas went further: sealed, misted, and refrigerated, his activated Matsui mixes stayed usable “multiple months.” The best prevention is ebscreen’s habit: mix colors the day before without activator and sharpie the activator amount on the lid — mornings run themselves.

Color matching has its own folklore: Sericol’s published Pantone starter formulas made it the community favorite for matching (alan802 nailed a match on the first try), and tonypep’s rule holds regardless of brand: “No matter the manufacturer, reds are always more vibrant when printed last and are more sensitive to over-activation.”

The smell is real. So is the fix.

A small shop ran 6,200 discharge prints and the whole crew ended up with sore throats despite masks, fans, and open doors. The diagnosis from the thread was unanimous and specific: their dryer exhaust ran fifteen feet sideways along a wall and around a door. “Straight up and out is the way to go,” Brandon wrote, convoluted exhaust runs never work. The other details that matter: the fumes come primarily from the dryer, not the wet ink (“as a wet ink you can only smell it if you stuck your face in it, but exiting the dryer… man does it stink,” Shawn reported); the biggest formaldehyde release happens the moment you mix activator into ink, so mask up then (Rockers); and respirator cartridges expire after days of use, not months. IntegrityShirts drew the line every shop should adopt: “If you can smell it heavily in the air in your shop, stop printing and fix the issue. No reason to risk health for a pile of cotton or cash.”

Does discharge printing actually save money?

Tonypep ran the numbers across his shop’s jobs and published the answer: roughly 15–20% cheaper than plastisol, with the savings growing as runs get shorter — because short runs are where eliminating the underbase screen, film, and setup time bites hardest. His two-color-on-darks example: no underbase means fewer screens, half the setup time, and you’re no longer laying down $40–60/gallon white plastisol at all. The catch is waste, activated leftovers are money in the trash, which his shop solved with ~80 documented stock formulas mixed unactivated in bulk. For a shop just starting out, his honest minimum for discharge to pay: about 144 pieces.

The threads quoted here span 2011–2022 on theshirtboard.com. Read them in full — the disagreements are as instructive as the conclusions.