Hazard communication (GHS) label prints missing pictograms — template, color & ribbon fixes

Joe B.

Reviewed for technical accuracy

Specialities: GHS/HazCom & CLP labels, Zebra ZPL, BarTender/NiceLabel, Thermal transfer, Resin ribbons, Color label printers

GHS pictograms not printing — red diamond border missing, overlay dropped, driver in monochrome mode

Technician

Hey! Let’s get your GHS / Hazard communication labels printing with all required pictograms (red diamond frames, exclamation mark, flame, corrosive, etc.). Which setup do you use: Zebra ZPL with thermal transfer and resin ribbon, or a desktop color label printer (Epson/Primera/OKI)? Are the pictograms missing entirely, printed in black instead of red, or showing as blank boxes?

Customer

Zebra ZD420, thermal transfer at 300 DPI with **resin ribbon**. We print from **BarTender**. The red GHS diamonds don’t appear; text and barcodes print fine. Sometimes the icon prints but the red border is gone.

Technician

Got it. On Zebra + BarTender this is usually one of four things:
1) Driver color mode set to Monochrome so the red layer is treated as white (dropped).
2) Template overlay—SVG/PNG pictograms—are not embedded; ZPL references can’t find the file (^XG lookup fails).
3) Transparency/flattening bug: CMYK PDF flattens and the diamond (spot/Pantone 485) disappears.
4) Incorrect media/ribbon: low energy or incompatible resin ribbon on glossy poly stock so the red preprint doesn’t transfer when using two-color ribbon/heads.
We’ll check each, then lock compliant output for OSHA/CLP.

Customer

We use BarTender’s GHS template with linked SVG pictograms. Driver is ZDesigner. Labels are BS5609-grade polyester with chemical-resistant topcoat.

Technician

Step 1 — Embed and layer correctly
• In BarTender/NiceLabel convert linked pictograms to Embedded Graphics and keep them as vector SVG (or 300-DPI PNG with transparency).
• For ZPL, store graphics to printer (^DG) and call with ^XG; position with ^FO. Ensure the overlay layer is above white boxes; avoid clipping groups.
• Disable “Image Dithering” for line art so the red diamond stays clean and meets HazCom visibility rules.

Customer

Where in the driver do we change color mode? Everything prints black even when the art is red.

Technician

Step 2 — Set driver color/print mode
• In **ZDesigner Properties → Options/Advanced**, switch from Monochrome to Use graphics as downloaded / Process color. For two-color heads pick the correct black/red panel (if applicable).
• Keep Resolution 300-DPI, Darkness tuned for resin ribbon, and Print speed moderate to prevent diamond gaps.
• If you have pre-printed red borders on the label stock, set driver to Black only and remove red artwork from the template to avoid registration issues.

Customer

Some labels show the exclamation icon but the red border is missing after we export to PDF and print.

Technician

That’s a classic CMYK → RGB flattening issue. Fix:
• In the design app set document to RGB; convert spot/Pantone red to device RGB (e.g., #FF0000).
• Enable “Preserve Overprints” or **flatten transparency** at high quality; avoid hairline strokes under 0.5 pt.
• Export pictograms as **SVG** or high-contrast PNG, then embed—don’t rely on the PDF renderer inside the driver.

Customer

Could ribbon or media be the reason the pictogram looks patchy or wipes off during chemical washdown?

Technician

Absolutely. For GHS/BS5609 compliance you need a resin ribbon matched to the film/topcoat (polyester, polypropylene).
• Run a media calibration, then test **darkness** and **speed**—resin needs higher energy but slower speed.
• If ink wipes, switch to a premium resin (chemical/UV resistant) or certified label stock from your supplier.
• Uneven diamonds often come from low head pressure or dirty platen—clean both with IPA.

Customer

We store pictograms on the printer. After a firmware update they disappeared. Now we get blank space where the diamond should be.

Technician

Step 3 — Restore ZPL graphics
• Re-download graphics with ~DG to E: (Flash) or R: (RAM) and call them via the exact path in ^XG (e.g., ^XGE:ghs_flame.GRF,1,1^FS).
• Verify ^LH/^FO coordinates and ^PW width after firmware reset; the wrong label length ^LL can clip overlays.
• Keep a printer profile backup so updates don’t wipe symbols again.

Customer

What if we move to a color label printer later? Will the same template work and pass OSHA/CLP?

Technician

Yes—just ensure the template uses vector pictograms and a pure red (#FF0000). On Epson/Primera enable the correct ICC profile, set **Gloss/Matte** to match media, and keep line art as vector so diamonds are razor-sharp. For compliance, verify label durability (abrasion, salt-spray) and keep your SDS data aligned with the printed hazard statements.

Customer

After embedding SVG and changing driver mode, the red diamonds print on every label. Any final checks so we’re audit-ready?

Technician

Final checks:
• Keep embedded SVG/PNG; avoid external links.
• Driver: Process graphics, 300-DPI, proper darkness/speed for resin; media calibrated.
• Template: diamonds on the top layer; no white boxes covering them; export in RGB.
• Keep sample prints + QA checklist for OSHA/CLP audits. Need a ZPL macro pack or BarTender template review? Open the chat.

Quick answer: the accepted fix

Accepted fix when a GHS label prints missing pictograms: embed SVG/PNG overlays, enable driver color processing (not Monochrome), store graphics and call them with proper ZPL layering, print at 300-DPI using a matched resin ribbon and certified label stock, and export artwork in RGB to avoid CMYK flattening.

FAQ

Step-by-step (Zebra + BarTender/NiceLabel)

1. Embed pictograms as SVG/PNG; avoid external links; keep on top layer.
2. Switch ZDesigner to Process graphics, 300-DPI; tune darkness/speed for resin ribbon; run media calibration.
3. Store overlays to printer (~DG) and reference with ^XG; verify ^PW/^LL/^FO after firmware updates.
4. Export artwork in RGB and flatten transparencies; avoid spot overprints that drop on render.

Note for mixed environments (Windows/macOS)

1. Use vendor drivers on both OSes; disable “Print as image” unless troubleshooting; keep vector overlays.
2. For color devices set correct ICC profile and media type (Gloss/Matte) to maintain GHS red.

Sources

• OSHA — Hazard Communication Standard (HazCom)
• Zebra — ZPL graphics, driver settings & media calibration
• BS5609 — Durability requirements for marine labels

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