Winsor & Newton Watercolor Iridescent Medium V4, 75 ml, Pearlescent Effects, Mix-In or Glaze, Suitable for Shimmering Washes

Pearlescent glow to transparent colors; flexible use (mix-in or glaze); flow-friendly to preserve brush feel and wash behavior; dries to a clear, permanent film; ideal for shimmering effects on water, wings, and other luminous details.

Shake well, then mix into your watercolor color at a small ratio (start around 1–5% by volume) or apply as a glaze over a dried layer. Build up the shimmer gradually and test on scrap to achieve the desired intensity.

It’s designed for use with watercolor paints to create pearlescent washes. It works both as a mix-in and as a glaze over transparent layers, while preserving wash behavior and remaining transparent when dry.

Begin with about 1%–3% by volume of the medium into your watercolor paint. Increase gradually up to 5% for a stronger pearlescent effect, testing as you go.

The medium is designed to be flow-friendly and maintain brush feel, so washes should behave normally. The dry film remains transparent and permanent once set.

Yes, it’s formulated for artists and is designed to be non-toxic and water-soluble, suitable for typical studio use. As with any art product, avoid ingestion and protect your eyes; follow standard safety practices.

Create shimmering water effects, add luminous highlights to wings or delicate details, and enhance transparent parts of a painting with a pearlescent glow without overpowering the color underneath.

Tightly reseal the cap, store in a cool, dry place, and keep the bottle upright. Clean brushes with water after use to prevent buildup on the ferrule.

If you’re exploring other iridescent options on Fepy, you may also look at: 1) Winsor & Newton Watercolor Iridescent Medium V3 (https://www.fepy.com/product/winsor-newton-watercolor-iridescent-medium-v3-75ml) — similar pearlescent effect with slight tonal differences. 2) Sennelier Iridescent Watercolor Medium (https://www.fepy.com/product/sennelier-iridescent-watercolor-medium-60ml) — may offer a different shimmer character and pigment compatibility. 3) Holbein Iridescent Watercolor Medium (https://www.fepy.com/product/holbein-iridescent-watercolor-medium-75ml) — another brand option with its own shimmer profile. Compare sheen level, drying behavior, and how they interact with your usual pigments to choose the best match.

A regular glaze adds color depth and subtle shading, while the iridescent medium adds a pearlescent glow that remains transparent when dry. You can combine both by glazing a color first and applying the iridescent medium over the dried layer for a luminous, multi-layered effect.

You can mix it with compatible watercolor media to achieve the desired shimmer. Avoid mixing with solvents or media not designed for watercolors, as they may alter flow and drying behavior.