What is pigment load?
Pigment load is the ratio of pigment to gum binder in a watercolour. A high pigment load means more pigment particles per unit of binder, so the paint lays down denser, more saturated colour, stains the paper more strongly, and tints further when mixed. Student watercolours reduce cost by cutting pigment with extenders - calcium carbonate, dextrin, fillers - which dilutes all three effects. A professional tube should release dense, saturated colour the moment it wets.
How to identify high pigment load
“Pigment load” is not printed on a label, but its consequences are. A high-pigment-load watercolour does two things a low-load paint cannot: it stains the paper, bonding to the fibres so the colour holds through subsequent glazes, and it tints - a tiny amount transforms a large wash. Michael Harding publishes both for every colour: staining power (Low, Medium, High) and tinting strength (1-4). The “High” staining, tint-4 colours are the highest pigment load in the range.
The highest-pigment-load watercolours, named
These are the “High” staining watercolours in the Michael Harding range, drawn live from the published staining and tinting data. Each links to its full product page with lightfastness, transparency and granulation ratings.
Picks are generated from the live watercolour range and will appear once the matching colours are loaded.
Why high pigment load matters
Pigment load governs how strong, how staining and how far a colour will go. A high-pigment-load watercolour gives saturated washes straight from the tube, stains for confident glazing, and tints an enormous amount of water or white before losing its identity. It is also better value: a tube of heavily loaded paint goes much further than the same size of an extended student paint, because a fraction of the pigment delivers the same colour.
Staining power and workability
High pigment load is a trade-off. Staining colours bond to the paper fibres and resist lifting, which is ideal for layered glazing but less forgiving if you want to lift and rework. Non-staining colours - the whites, many earths and sedimentary pigments - lift and soften freely. A professional palette balances the two: staining colours for permanence and saturation, lifting colours for atmosphere and correction. Reading the staining power on each tube lets you build that balance deliberately.
Pigment load vs single-pigment formulation
Pigment load and single-pigment formulation are independent qualities. A colour can be single-pigment but low load (many earths), or a multi-pigment blend taken to a high load (some convenience greens). The best professional watercolours are both single-pigment and high-load: one chemistry at maximum saturation, so the colour is clean, strong and predictable. See the best single-pigment watercolours guide for the colours that satisfy both.
Frequently asked questions
Which watercolours have the highest pigment load?
The watercolours with the highest pigment load are the heavily staining, high-tinting colours - the phthalocyanines (Phthalo Blue, Phthalo Green), quinacridones and pyrroles (Pyrrole Red, Perrindo Maroon), the dioxazine and indanthrone darks (Deep Purple, Indanthrone Blue), the cadmiums and the dense earths. In the Michael Harding range these carry a "High" staining rating and a top tinting strength, which is the on-paper evidence of a paint taken to maximum pigment saturation.
What is pigment load in watercolour?
Pigment load is the ratio of pigment to gum binder in a watercolour. A high pigment load means more pigment particles per unit of binder, so the paint lays down denser, more saturated colour, stains the paper more strongly and tints further when mixed. Student watercolours cut pigment with extenders, which dilutes all three effects. Pigment load is the single biggest factor separating professional watercolour from student paint.
How can I tell if a watercolour has high pigment load?
You cannot read "pigment load" off the label directly, but you can read its consequences. High-pigment-load watercolours stain the paper strongly and have a high tinting strength - a tiny amount transforms a wash. Michael Harding publishes staining power (Low / Medium / High) and tinting strength (1-4) for every colour, so the "High" staining, tint-4 colours are the highest pigment load in the range.
Why does pigment load matter?
Pigment load matters because it governs how strong, how staining and how far a colour will go. A high-pigment-load watercolour gives saturated washes straight from the tube, stains the paper for glazing, and tints a huge amount of water or white before losing its identity. It is also better value: a tube of high-pigment-load paint goes much further than the same size of an extended student paint.
Are higher-pigment-load watercolours harder to lift?
Generally yes. High-pigment-load, staining colours bond to the paper fibres and resist lifting and reworking, which is ideal for layered glazing but less forgiving for wet-on-wet blending that you want to lift back. Non-staining colours (the whites, many earths and sedimentary pigments) lift and soften more freely. Choosing by staining power lets you balance permanence against workability.
Does Michael Harding make high-pigment-load watercolours?
Yes. Michael Harding watercolours are hand-mulled and taken toward each pigment's maximum saturation point rather than blended to an average, which is what gives the staining colours their exceptional tinting strength. The staining power and tinting strength are published for every colour, so painters can identify the highest-pigment-load colours directly.