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Phthalo Blue
About these coordinates About these coordinates
— Color coordinates —
Hex triplet #000f89
RGBB (r, g, b) (0, 15, 137)
HSV (h, s, v) (233°, 100%, 54%)
Source The Mother of All HTML Colo(u)r Charts
B: Normalized to [0–255] (byte)

Phthalocyanine Blue BN, also called monastral blue, phthalo blue (and others) (CAS 147-14-8, EINECS 205-685-1) is a bright, greenish-blue crystalline synthetic blue pigment from the group of phthalocyanine dyes.

It was first developed as a pigment in the mid-1930s. Its brilliant blue is frequently used in paints and dyes. It is highly valued for its superior properties such as light fastness, tinting strength, covering power and resistance to the effects of alkalies and acids. It has the appearance of a blue powder, insoluble in water and most solvents.


Synonyms and trade names

Phtalocyanine Blue in powder form

The substance, chemical name (29H,31H-phthalocyaninato(2-)-N29,N30,N31,N32)copper (or Copper phthalocyanine)[1] is also known as monastral blue, phthalo blue, helio blue, thalo blue, Winsor blue, phthalocyanine blue, C.I. Pigment Blue 15:2, Copper phthalocyanine blue, Copper tetrabenzoporphyrazine, Cu-Phthaloblue, PB-15, PB-36, and C.I. 74160. Numerous other trade names and synonyms exist.[2]


Due to its stability, phthalo blue is also used in inks, coatings, and many plastics. The pigment is insoluble and has no tendency to migrate in the material. It is a standard pigment used in printing ink and the packaging industry.

A common component on the artist's palette, Phthalo Blue is a cool blue with a bias towards green. It has intense tinting strength and easily overpowers the mix when combined with other colors. It is a transparent staining color and can be applied using glazing techniques.

Industrial production was of the order of 10,000 tonnes pa in the 1980/90s in Japan alone.[2] The pigment is the highest volume pigment produced.[3]

Phthalocyanine Blue BN is also used as a source material for manufacture of Phthalocyanine Green G.

Structure, reactivity and properties

Phthalocyanine Blue BN

Phthalocyanine blue (C32H16N8Cu) a complex of copper with phthalocyanine. Molecular mass is 576.08,[1] melting point 600 C (with decomposition), the substance is practically insoluble in water (<0.1g / 100ml @ 20C),[1] but soluble in concentrated Sulphuric acid[2] Density of the solid is ~1.6g/cc.[2]


Toxicity and hazards

The compound is non-biodegradeable, but not toxic to fish or plants.[2] No specific dangers have been associated with this compound.[4] Oral LD50 in mammals is estimated to be greater than 5g per kg, with no ill effects found at that level of ingestion,[2] for chronic ingestion levels of concern were found to ocuur at 0.2g/kg or greater.[2] There is no evidence for carcinogenic, negative reproductive, teratogenic or mutagenic effects yet known.[2]

See also

External links


  1. ^ a b c Copper phthalocyanine
  2. ^ a b c d e f g h COPPER PHTHALOCYANINE, CAS No.: 147-14-8
  3. ^ Industrial applications of phthalocyanines. Author : Peter Gregory, Journal of Porphyrins and Phthalocyanines (JPP) Vol 4 Issue 4 Year 2000 via
  4. ^ Safety data sheet


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