Pan vs Tube Watercolors for Mixing Colors
Choosing between pans and tubes depends on how much paint you need at once. Tubes allow you to squeeze out fresh, moist pigment that blends instantly with water on your palette. Pans are essentially dried-down versions of these same tubes, which makes them convenient but harder to work with when you need a deep, saturated pool of color for a large painting surface.
What are the primary differences in pigment concentration between pan and tube watercolors?
Tube paints contain a higher percentage of binder, such as gum arabic, to maintain a creamy, paste-like consistency, whereas pans are specifically formulated to dry into a hard, stable cake. Many artists assume that pan paints are inherently less pigmented than tubes, but the pigment load is often identical; the difference lies in the ease of extraction. Because pan paints are designed to be rehydrated, they contain additives like ox gall or honey to encourage water absorption, which can slightly alter how the paint behaves compared to fresh tube pigment.
Quick facts
| Feature | Tube Paint | Pan Paint |
|---|---|---|
| Mixing Speed | High | Moderate |
| Saturation | High | Medium |
| Prep Time | Instant | Rehydration needed |
| Best For | Large washes | Small details |
How does the drying process affect the re-solubility of tube paints compared to pre-poured pans?
No, re-solubility depends on the binder rather than the container. Most professional-grade tubes contain humectants like glycerin that keep paint re-soluble for years, while student-grade paints often lack these additives and may become brittle. A 5% increase in glycerin content significantly improves the ease of re-wetting dried paint.
Which format offers greater convenience for plein air painting and travel?
Pan sets offer superior portability for outdoor work because they eliminate the risk of leaking tubes and allow for a compact, all-in-one kit.
- Half-pans: These small plastic containers allow you to carry 12 to 24 colors in a footprint no larger than a smartphone.
- Metal tins: These durable cases provide integrated mixing wells that fold out to give you enough surface area for complex color blends.
- Travel brushes: Collapsible handles allow these tools to fit inside the tin, keeping your entire setup contained in a single jacket pocket.
- Water containers: Using a clip-on cup or a collapsible silicone bowl keeps your workspace organized without requiring extra bag space.
How do the physical consistency and viscosity of tube paints influence the ease of creating large-scale color washes?
The high viscosity of tube paint allows for the rapid loading of a large mop brush, which is necessary for covering expansive areas like skies or background washes. Because the pigment is already suspended in a concentrated, moist binder, you can pull a significant amount of color into a mixing well without excessive scrubbing. This fluidity makes sure that the paint remains uniform as you apply it to the paper, preventing the streaky, uneven distribution that often occurs when attempting to build a large wash from a dry pan.
For example, when painting a 22-by-30-inch sheet of watercolor paper, a single squeeze of ultramarine blue from a tube provides enough intensity to cover the entire surface without needing to stop and re-load. One nuance is that certain heavy pigments, such as cadmium reds, can become difficult to disperse evenly if the water-to-paint ratio is not carefully managed during the initial mixing phase.
What are the cost-effectiveness trade-offs when comparing individual tube refills to replacing entire watercolor pans?
Buying individual tubes is almost always more cost-effective because you only replace the colors you use most frequently rather than discarding an entire plastic pan housing.
| Item | Cost Efficiency | Waste Factor |
|---|---|---|
| 5ml Tube | High | Low |
| 15ml Tube | Highest | Minimal |
| Full Pan | Low | High |
| Half Pan | Moderate | Medium |
Use these figures to calculate your price per milliliter, which typically reveals that 15ml tubes offer a 30 to 50 percent savings over buying pre-filled pans.
Which medium is better suited for maintaining the longevity and purity of watercolor brushes?
Tube paints are generally safer for brush longevity because they require less aggressive physical friction to load the bristles compared to the repetitive scrubbing needed for hard pans.
- Natural hair: Sable or squirrel brushes suffer from premature breakage when forced to abrade against the hard, dry surface of a pan.
- Synthetic filaments: These stiffer fibers are more resilient, but they still benefit from the smooth, buttery consistency of tube paint during long sessions.
- Ferrule integrity: Repeatedly jamming a brush into a small pan can force water and pigment into the ferrule, eventually loosening the glue.
- Cleaning frequency: Using tube paint reduces the amount of sediment trapped in the brush heel, which preserves the shape and spring of the tip.
How can artists effectively combine both formats to optimize their color-mixing workflow?
The most efficient workflow involves using a primary palette of dried pans for quick sketches and on-the-spot color adjustments, while keeping a secondary palette of fresh tube paint for large-scale work. By squeezing fresh pigment into a dedicated mixing tray or a large well, you maintain the ability to create high-intensity washes without the labor of rehydrating hardened cakes. This dual approach allows you to bridge the gap between the speed of a studio setup and the mobility of a travel kit.
For instance, an artist might use a travel pan set to establish the initial values of a landscape before switching to a tube-fed palette to add rich, saturated foreground details. One important exception is when working with fugitive or staining pigments; in these cases, using fresh tube paint is necessary to make sure the color remains vibrant and doesn't become muddy through over-mixing or excessive rehydration.
What people often get wrong
- Using too little water. Beginners often fail to pull enough pigment from a pan, resulting in chalky, pale mixes that lack depth.
- Letting tubes dry out. Leaving caps off turns expensive tube paint into hard, difficult-to-rehydrate lumps that lose their original texture.
- Ignoring mixing surface size. Trying to mix large quantities of paint on a tiny travel palette usually results in muddy, inconsistent colors.
Selecting the Right Format
For artists who frequently paint large-scale works, tubes provide the necessary volume and flow for consistent color mixing. If your work focuses on smaller, portable projects, stick with pans to keep your setup manageable and clean.