Name: China Supplier High Quality Wholesale Price C.I. 564100 CAS 6925-69-5 for Resin dye
Brand: Wuhan Fortuna Chemical Co., Ltd.

In simple terms, C.I. 564100 is the generic name for the organic pigment commonly known as Phthalocyanine Blue GS.

Let's break down what that means:

1. What is the Colour Index (C.I.)?

The Colour Index is a universal, standardized system used to classify dyes and pigments. Each entry has two parts:

Constitution Number: This describes the chemical structure. For C.I. 564100, the constitution number is 74160, which identifies it as a specific type of copper phthalocyanine.
Generic Name: This describes the color and application class. The "Pigment Blue 15" part is the most commonly used name.

So, the full classification is:

Generic Name: Pigment Blue 15
Constitution Number: 74160
Commercial/Historical Name: Phthalocyanine Blue GS

The number C.I. 564100 is a specific identifier used within this system to point to this exact pigment.

2. What is Phthalocyanine Blue (PB15)?

Phthalocyanine Blue is one of the most important and widely used synthetic organic pigments. It's famous for its:

Intense, Bright Blue Color: It's a very strong, clean blue.
Excellent Properties: It has outstanding lightfastness (resistance to fading), heat stability, and chemical resistance.
Cost-Effectiveness: It's relatively inexpensive to produce, making it a workhorse pigment for many industries.

Common Variations (Shades)

Pigment Blue 15 has several crystal forms, which are designated by a colon and a number. You will often see:

PB15:0 (Alpha Blue): A reddish-blue, the earliest form. It can flocculate and is less stable in some solvents.
PB15:1 (Alpha-Stable Blue): A stabilized version of the alpha form with improved properties.
PB15:2 (Alpha-Stable, Non-flocculating): Similar to PB15:1 but also resists flocculation.
PB15:3 (Beta Blue): A greenish-blue. This is the most common and stable form, widely used in printing inks and plastics.
PB15:4 (Beta-Stable, Non-flocculating): A stabilized version of the beta form.
PB15:6 (Epsilon Blue): A reddish-blue with different crystallization.

C.I. 564100 (or PB15) most commonly refers to the standard Beta Blue (PB15:3) version unless otherwise specified.

Where You Would Find It

This pigment is ubiquitous:

Artist Paints: A primary blue in oils, acrylics, and watercolors.
Printing Inks: Especially for cyan in four-color process printing (CMYK).
Plastics and Polymers: Used to color a vast range of plastic products.
Coatings and Paints: For automotive, industrial, and architectural paints.
Textiles: In some types of dyeing and printing.

Summary

Term	Meaning
C.I. 564100	The Colour Index identifier for a specific blue pigment.
Pigment Blue 15 (PB15)	The common generic name for this pigment.
C.I. 74160	The chemical constitution number for copper phthalocyanine.
Phthalocyanine Blue GS	A common commercial name for the pigment.

In short, if someone is referring to C.I. 564100, they are talking about the standard, high-performance blue pigment found in countless everyday products.