Cerulean Blue (15ml Watercolours)


Green-Blue, Opaque


Cerulean Blue has been selected as our principal green-blue because of its versatility. It is opaque and handles very well. It will give bright greens with our Hansa Yellow (although not as bright as with Phthalocyanine Blue) and opaque mid greens with Cadmium Yellow Light. It is absolutely light fast.




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SKU: PW CBWC16 123726 Category: Tag:


  • Absolutely lightfast, it gained an ASTM rating of 1 (excellent) in all of our media during lightfast testing. A most reliable pigment with many useful qualities. The chemical make up of Cerulean Blue varies from oxides of Cobalt and Tin (Cerulean Blue PB 35) to Oxides of Cobalt and Chromium. Generally (PB36).
  • Both PB 35 and PB 36 are similar in hue, being blues with a definite bias towards green. Being particularly opaque it has very good covering power. This can be very useful when areas of work have to be covered by a relatively thin layer of paint. Non-metallic preservatives.
  • There are many imitations on the market which are simply mixes of cheaper pigments. It pays to look for the description PB 35 or PB 36



Additional information

Weight .035 kg
Dimensions 9 × 2 × 2 cm
Type of Paint

Artists Quality Watercolour Paint

Colour Type

Green-Blue, Opaque

Common Name

Cerulean Blue, Chromium

Colour Index Name

PB36 (Pigment Blue 36)

Colour Index Number


Chemical Class

Oxides of Cobalt and Chromium

ASTM rating

Absolutely lightfast, it gained an ASTM rating of 1 (excellent) in all of our media during lightfast testing.



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Our Paints

As any reader of my books will know, I suggest a limited palette of lightfast colors which will give the maximum possible range of mixes. I do not base any of my suggestions on romantic ideas from the past but solely on the qualities of the pigment used. We now have at our disposal the finest colorants of all time. Unfortunately, there are also many inferior or poorly labeled substances on the market.
As many artists have experienced difficulty in identifying suitable colors, which are also lightfast, I have introduced our own paints. They are intended only for those with a clear understanding of the thinking that is behind them. In other words, they are for use within the School by the discerning colorist requiring the best available materials.
I wanted a limited range of high quality, lightfast colors which would be compatible with each other and give the widest possible range of mixes. The paints are specially produced for the School in small, controlled batches. They are made to my specification and contain only high quality, lightfast, genuine pigments. Readers of my book ‘Blue and Yellow Don’t Make Green’ will have found that six colors are enough for a vast range of mixes. To these six – two reds, two yellows and two blues – I have added Phthalocyanine Green as a clear mid-green; Burnt Sienna to give a neutral transparent orange; Yellow Ochre as a neutral orange-yellow; Phthalocyanine Blue to provide a transparent green-blue; Raw Sienna for a semi-transparent neutral orange-yellow; and White.
I also wanted the same, carefully selected pigments to be used in each media. The same pure Cadmium Red (for example) to be used in the watercolors, oils, acrylics and artists gouache. Never before done.
The more we know about our colors the more versatile they become. I have examined and tested virtually every modern paint in the world as part of my research and genuinely feel that we offer the finest possible range of colors. There are only twelve colors in total. As these twelve can be mixed to give several million other hues, I feel they are more than enough..

Our Labels

The colour name on our labels might seem a little unusual at first. To label a colour as, say, ‘Cerulean Blue’ does not tell us very much. We label the same colour ‘GREEN-BLUE OPAQUE’, followed by the traditional name.

Also included is a colour mixing guide based on our palette. At a glance the user knows (in the case above), that a blue has been selected which can give bright greens and dull violets and will cover previous work well, being opaque..


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