Spot Color Reference Guide

Printing Industry Reference

Understanding Pantone Matching System References for Custom Printing Inks

A practical guide to reading spot-color designations, preventing order-entry mistakes, and confirming custom ink requirements for offset and screen printing.

On this page:
Overview | Read a Designation | Color Families | Ordering Checklist | Order Custom Ink | Screen Limitations | FAQ

What Is the Pantone Matching System?

The Pantone Matching System is a widely used spot-color communication system in commercial printing, packaging, screen printing, design, and product decoration. A spot-color reference gives a customer, designer, ink supplier, and printer a shared way to identify an intended color target.

For a custom ink mix, the designation is only the starting point. The printed result can change with the ink vehicle, pigment strength, opacity, mesh count, press or screen-print process, substrate color, coating, cure method, lighting, and viewing conditions.

Important: This is an independent educational resource. It does not provide official color chips, ink formulas, color libraries, or a digital replacement for a physical color guide. Use a current physical standard, approved drawdown, or production proof for final color selection and approval.

How to Read a Spot-Color Designation

A complete reference commonly includes a number or a recognized color name followed by a paper-stock suffix. For example, PANTONE 273 C is a color reference with the identifier 273 and a coated-stock suffix, C.

Part	Example	What It Communicates
Color identifier	273	Identifies the requested spot-color reference in the relevant guide.
Named reference	Reflex Blue	Some commonly used spot-color references use names rather than a purely numeric identifier.
Coated suffix	C	Indicates the coated-paper version of the reference. Always include it in an order request when that is the intended standard.
Complete request	PANTONE 273 C	The full entry a customer should verify before a custom mix is made.

Do not omit the suffix or substitute a similar-looking number. Different references that share part of a number can represent distinctly different color targets. Enter the complete designation exactly as it appears in the physical guide or approved artwork.

Common Traditional Reference Families

The following high-level categories can help customers describe what they need. They are informational range references, not a color chart or a substitute for an official guide.

Traditional Solid References

The legacy solid range contains familiar spot-color identifiers and established suffix families used in commercial print specifications. Named standards such as Process Yellow, Warm Red, Reflex Blue, Process Blue, Green, and Black are also commonly encountered.

Traditional Metallics

Traditional metallic base references are commonly identified as 871 C–877 C. Metallic appearance depends heavily on ink formulation, substrate, coating, print coverage, and lighting, so use an actual drawdown or physical guide for approval.

Legacy Fluorescents

Legacy fluorescent reference ranges commonly include 801 C–814 C and 901 C–942 C. Fluorescent inks are particularly difficult to evaluate on screen and can change under different light sources.

How to Order a Custom Ink Mix Accurately

Use this process to reduce transcription errors and avoid producing an unwanted color.

1 Copy the full reference exactly. Include all digits, any recognized name, and the suffix—for example, “PANTONE 273 C.”

2 Confirm the production conditions. State whether the ink is for offset or screen printing, then specify the substrate, ink system, opacity requirement, coating, and curing method where relevant.

3 Provide a physical target when possible. A current physical guide, approved sample, prior drawdown, or production proof is the best way to communicate the target color.

4 Review the written confirmation. Before mixing begins, compare the order confirmation against the reference in your artwork or physical guide.

5 Approve a drawdown for critical work. For brand, packaging, repeat, or high-value jobs, approve a drawdown on the actual substrate or a representative stock before full production.

Order-Accuracy Tip: Treat the exact written reference as the customer’s requested target. A screen preview, RGB value, HEX code, or CMYK conversion should never override a confirmed physical standard or approved proof.

Order a Custom PMS Spot-Color Offset Ink Mix

Ready to order ink for your selected spot-color reference? KMI Royal Series offset ink is available in conventional oil-base and rubber-base formulations for custom PMS spot-color mixing.

Choose Your Ink Type

Select conventional oil-base or rubber-base ink based on your offset press, substrate, drying requirements, and production conditions.

Select Your Quantity

Select the quantity needed for your job. Available package sizes include 1 lb, 2 lb, 5 lb, 10 lb, and 20 lb options.

Enter the Full Reference

Enter the exact requested PMS designation in the product notes box, including the full number, recognized color name where applicable, and coated-paper suffix.

For critical color matches: Select the custom-match option and provide a printed sample plus representative substrate samples when requested. A physical sample or approved drawdown is more reliable than a monitor image or digital color conversion.

Order KMI Royal Series PMS Spot-Color Offset Ink »

Before ordering, verify the full requested spot-color designation against your physical guide, approved sample, or written production specification.

Why a Screen Cannot Approve Ink Color

Computer and phone displays create color with emitted light; printing inks create color with reflected light. A screen image therefore cannot reliably simulate every physical ink, especially metallic, fluorescent, opaque, transparent, or specialty inks.

Display Variation

Displays vary by model, age, brightness, calibration, browser, operating system, and color-management settings.

Production Variation

Physical printing varies with substrate color and absorbency, ink film thickness, coverage, mesh count, press conditions, coating, curing, and viewing illumination.

Conversion Limitations

RGB, HEX, and CMYK values are conversions for particular digital or process contexts; they are not universal spot-ink formulas.

For this reason, use digital values only for general layout and communication. Use a physical standard, a drawdown, or an approved proof when color accuracy matters.

Custom Ink Order Details to Provide

Information	Why It Matters
Complete spot-color designation	Prevents errors caused by incomplete numbers, transposed digits, or missing suffixes.
Printing process	Offset and screen-print applications can require different ink systems and performance characteristics.
Substrate and color	White paper, clear film, dark stock, coated materials, and uncoated materials can produce materially different results.
Opacity or transparency requirement	Determines whether the ink must cover a substrate, allow it to show through, or work with an underbase.
Finish, coating, and curing method	Gloss, matte, varnish, lamination, UV cure, heat cure, and other finishing conditions influence the final appearance.
Physical standard or approved sample	Provides the strongest available target for visual matching and production approval.

Frequently Asked Questions

What does the C mean in a Pantone color designation?

The C suffix identifies the coated-paper version of a spot-color reference. Paper stock affects visual appearance, so include the suffix whenever you provide a color reference for a custom ink order.

Can I use a monitor to approve a custom ink color?

No. A monitor can help with general communication, but it is not a production color standard. Final approval should use a current physical guide, a supplied physical sample, an approved drawdown, or an approved production proof.

What should I provide when ordering a custom spot-color ink mix?

Provide the complete designation including its suffix, the intended printing process, substrate, ink system, finish or coating, opacity needs, and any physical guide or approved sample available. Confirm the exact designation before production begins.

What are traditional metallic and fluorescent spot-color references?

Traditional metallic base references are commonly identified as 871 C through 877 C. Legacy fluorescent reference ranges commonly include 801 C through 814 C and 901 C through 942 C. Confirm the intended target against a current physical standard before production.

Are RGB, HEX, and CMYK values exact equivalents of a spot-color reference?

No. They are context-dependent digital or process conversions. They may be useful for layouts and broad visual communication, but they do not replace a physical spot-color guide, an ink formula, or an approved proof.

Trademark and Color-Reference Notice

PANTONE® and the Pantone Matching System are trademarks of Pantone LLC. This independent educational page is not affiliated with, sponsored by, or endorsed by Pantone LLC. It does not reproduce official color chips, formulas, or a Pantone color library. For current official standards and production color selection, consult a current Pantone publication and use an approved physical proof or drawdown.