Union Ink

Discharge White Gallon

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Discharge printing is a process where water-based inks are applied to certain "dischargeable" dark colored garments to produce very bright, soft prints. As the discharge inks are printed and heat cured, the original dyes on the garment are being reduced, or "discharged", from the image area and the printed image is bonded to the fabric. The result is a brightly colored, opaque print which has been applied directly to a virtually "undyed" area of the fabric. These prints will have a very soft hand.


The Preprint Discharge system consists of two parts: The Preprint Discharge ink base (either the Preprint White DSPP-1000 or Preprint Clear DSPP-9050) and the DSPP-9ZFS Preprint Discharge Agent. The DSPP-9ZFS agent is furnished as a powder in a separate container.

Add 6-8% DSPP-9ZFS Preprint Discharge Agent by weight to the Preprint Discharge ink base (either DSPP-1000 Preprint White or DSPP-9050 Preprint Clear). Mix until totally dissolved.

CAUTION: Minimize the unused portion by only mixing enough of the ink system as will be used in one printing run. Use the entire mixture on the same day it is mixed.



CHECK THE GARMENT: Only garments which have been designated for discharge printing should be used. Particular dyes must be used by the garment mill to allow them to be completely and consistently discharged; not all garment manufacturers use these "dischargeable" dyes. Consult the garment manufacturer to ensure that you are using their recommended garment for discharge printing.

TO TEST THE DISCHARGE PROPERTIES OF A SPECIFIC GARMENT: Print a small amount of the DSPP-9ZFS Preprint Discharge Agent mixed with Preprint Discharge Clear onto a portion of the garment and then heat cure. If the curing conditions are sufficient and the garment has the required discharge properties, the printed area will appear to have an ivory-like white color; if the printed area appears darker or brownish in color, the garment should not be used in discharge printing.


Print on a hard pallet surface with a medium or hard, sharp squeegee. The squeegee must be sufficiently stiff to ensure that the discharge ink mixture is driven into the fabric.

When the plastisol ink is overprinted, the printed image may appear very weak and muddy and overpowered by the garment color. This should not cause concern as proper heat curing will trigger the discharging process in the Preprint Discharge and produce the desired effect for the overprinted image.

MULTI-COLOR PRINTING: Multi-color printing can be done wet-on-wet without flash curing in between colors.


A very common problem encountered during discharge printing is incorrect curing of the printed image. The discharge agent is only effective when it is mixed into a specially-formulated water based ink and steamed into the fabric at a very high temperature.

The discharge agent will not be activated unless the temperature of the print is raised to 330-350F (166-177C). Also, the overprinted plastisol colors will only cure after the water has been completely evaporated from the Preprint Discharge underbase; therefore 1½-3 minute curing time is recommended.

Conveyor drying unit should be properly vented with adequate air flow to ensure successful discharge reaction and plastisol curing.


All screens, squeegees, and their related tools should be thoroughly cleaned after use. Use water and a non-abrasive detergent, such as Union Ink's ATEX-9400 Detergent Wash-Up.


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Additional Info

Additional Info

14.00 LBS
Calculated at Checkout