
Sky Blue (Phthalo)
PW4—Synthetic mineral - zinc oxide, introduced as a painter’s white c.1780. A late arrival, zinc white was taken up by the Impressionists for clean, non-toxic tints and by 19th-century watercolourists; Turner was among the early adopters. Valued for transparency, slow drying and a lack of yellowing - the white of choice for pale tints and delicate glazes.
PB15.3—Phthalocyanine Blue (green shade). Synthetic organic. A stabilised green-shade phthalo blue; very strong and permanent.
Sky Blue (Phthalo) is a multi-pigment Michael Harding watercolour made with PW4, PB15.3.
It is semi-transparent, excellent lightfastness, non-granulating, medium staining power, tinting strength 3.
- Code
- W114
- Series
- Series 1
- Pigment Index
- PW4, PB15.3
- Contents
- 15ml tube
- Lightfastness
- Excellent
- Transparency
- Semi-Transparent
- Tint Power
- 3
- Granulation
- NO
- Staining Power
- Medium
Measured colour data
Loading measured pigment data…
Tint · Tone · Shade · Glaze
Preview how Sky Blue (Phthalo) behaves when mixed, toned, shaded and glazed. Each swatch is computed from the masstone using a perceptual subtractive model - an approximation for guidance, not a formulation guarantee.

Sky Blue (Phthalo) straight from the tube.
A thin wash over white.
Mixed with Titanium White.
Mixed with a mid neutral grey.
Darkened with a chromatic black.
A thin transparent film over white.
Popular combinations
Open Sky Blue (Phthalo) in the Virtual Mixing Studio to preview how it combines with these partners before you reach for the palette.
Open Sky Blue (Phthalo) in Mixing StudioFeatured in 1 palette
What pigment is used in Sky Blue (Phthalo)?
Sky Blue (Phthalo) is made with PW4, PB15.3.
Is Sky Blue (Phthalo) a single-pigment colour?
No. Sky Blue (Phthalo) is a blend of 2 pigments (PW4, PB15.3), formulated to give a specific hue.
Is Sky Blue (Phthalo) transparent or opaque?
Sky Blue (Phthalo) is semi-transparent.
Is Sky Blue (Phthalo) lightfast?
Sky Blue (Phthalo) has excellent lightfastness.
Does Sky Blue (Phthalo) granulate?
In watercolour, Sky Blue (Phthalo) is non-granulating.
Does Sky Blue (Phthalo) stain the paper?
Sky Blue (Phthalo) has medium staining power.
Is Sky Blue (Phthalo) vegan?
No. Michael Harding watercolours contain a small amount of honey, so the finished paint is not vegan.
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Colour Disclaimer: Colours shown on screen or in print may vary from the actual product. For the most accurate representation of colour, texture and finish, we recommend viewing a physical sample or swatch in person before making your final selection.









