Why Pigment Load Matters in Screen Print Ink

Most collectors look at colour first. Vibrant red. Deep navy. Clean white. But the quality of that colour depends on something you can't see at a glance: pigment load.

Pigment load is the concentration of solid colour particles suspended in the ink base. Higher pigment load means more colour, less filler. It affects everything from how opaque a layer looks to whether that print will fade in ten years.

I've been pulling screens for twenty-six years. I learned at Central Saint Martins that cheap ink is a false economy. You can feel the difference in the squeegee. You can see it in the finish. And collectors notice, even if they don't have the vocabulary for it.

What Pigment Load Actually Does

When you print a layer of ink through a screen, you're pushing a liquid suspension onto paper. That liquid contains pigment particles, binder resin, and often extenders or fillers.

High pigment load means the ratio tips toward pure colour. The print covers cleanly in one pass. Low pigment load means more transparent layers, sometimes a chalky or washed-out appearance, and weaker fade resistance over time.

I print mostly on Somerset Satin 300gsm. It's a bright white stock. If my ink has poor pigment load, that white shows through. I'd need two or three passes to build opacity. That risks registration drift and adds drying time between layers. One clean pass is always the goal.

Opacity and Coverage

Opacity matters most when you're printing light colours over dark, or when you want a solid block of colour without paper texture bleeding through.

Inks with high pigment concentration sit on the paper surface. They cover completely. Inks with low pigment load let the paper fibres show. That can be beautiful in some contexts, but it's not the effect I'm after when I'm building bold, graphic layers.

Some printers use white undercoats to boost coverage. I prefer ink dense enough to do the job without that step. It keeps the edition consistent and the print surface cleaner.

Fade Resistance and Longevity

Pigment load directly affects lightfastness. More pigment means more UV-stable particles protecting the print from degradation.

I use lightfast pigments rated ASTM I or II. But even the best pigment won't perform if it's diluted with too much filler. Collectors buying a limited edition expect that print to look the same in twenty years. Pigment load is part of that promise.

Cheap inks stretch pigment with extenders. That cuts manufacturing cost but sacrifices longevity. Over time, those prints lose vibrancy. The colour shifts. In harsh light, they fade faster.

I won't risk that. Every edition I pull is hand-numbered and signed. If a collector frames it and hangs it in indirect light, I want that print to outlast me.

Ink Transparency and Overprinting

Not all pigment load needs to be high. Transparent inks have lower pigment concentration by design. They let underlayers show through, creating optical mixing when you overprint.

If I want a glaze effect or a subtle shift where two colours overlap, I'll use a transparent ink. But that's a deliberate choice, not a cost-cutting measure. The pigment quality is still high. It's the load that's adjusted.

Knowing when to use opaque versus transparent ink is part of planning a print. I map out every layer before I expose the first screen. Pigment load is part of that technical decision.

How to Assess Pigment Load as a Collector

You can't measure pigment load by eye, but you can look for clues. Hold the print at an angle. Does the ink sit proud of the paper, or does it look thin and soaked in?

Check the colour in good light. Does it look rich and even, or patchy and flat? Does the paper texture show through in solid areas where it shouldn't?

If you're comparing editions by different artists, look at how much the ink layer catches the light. Thick, well-pigmented ink has a slight sheen and a tactile surface. Weak ink looks dull and tends to sit flat.

Also ask the artist or gallery about ink choice. Serious printmakers will happily talk about pigment quality. If the answer is vague, that tells you something too.

Why I Care About This

I'm not interested in cutting corners. My editions are limited and hand-pulled. Each one takes hours. If I'm investing that time, the materials need to match the effort.

High pigment load costs more. The ink is heavier to ship. It doesn't stretch as far. But the prints are better. Collectors notice that, even if they can't name it.

When someone buys one of my prints, they're trusting me to deliver something built to last. Pigment load is part of that contract. It's invisible on the invoice, but it's there in every layer.

If you'd like to see the prints I'm currently making, visit olifowler.com. Every edition is strictly limited and hand-pulled. Once they're gone, they're gone.