Sanhu Color Co., Ltd

14/08/2026

How Does a Laboratory Decide: Release or Reject?

A pigment can look perfect in the lab - and still not be ready for production.

Before a product is released, the laboratory looks at much more than colour.

What is checked?

◆ Shade & strength
Does the pigment meet the target colour and tinting strength?

◆ Heat stability
Can it withstand the temperatures required for the intended application?

◆ Chemical resistance
How does it perform against water, oil, acids, alkalis, and other conditions?

◆ Light fastness
Will the colour remain stable during long-term exposure?

◆ Application performance
Does it disperse properly? Does it behave consistently in the intended system?

◆ Batch consistency
Most importantly - does it match the required specifications from batch to batch?

Only when the results meet the defined requirements can the laboratory give the product the green light.

And sometimes the answer is simply:
Not yet.

A batch may need adjustment, additional testing, or further evaluation before it can leave the factory.

Because in pigment production, releasing a product is not just about achieving the right colour.

It is about being confident that the product will perform the same way when it reaches the customer's production line.

At Sanhu Color, laboratory testing is an essential step between pigment development and reliable industrial performance.

Have a Technical Question About Pigments?
We'll help find the right solution for your application.

📧 [email protected]
📱 WhatsApp / Telegram: +86 187 5199 6743

12/08/2026

Pigment Blue 15:4 (PB15:4) is a copper phthalocyanine blue widely used when a clean, strong and stable blue is required.

But choosing PB15:4 is not only about getting the right shade.
Its performance depends on the application, formulation and processing conditions.

Why is PB15:4 widely used?

• Excellent colour strength - provides a strong blue with relatively low dosage
• Good light fastness - suitable for applications where colour stability matters
• High heat resistance - an important advantage for many plastic applications
• Good chemical resistance - performs well in demanding formulations
• Clean blue shade - suitable for applications requiring a bright and consistent blue

PB15:4 can be found across a range of applications, including plastics, coatings and printing inks, depending on the specific grade and formulation.

At Sanhu Color, we focus not only on the Colour Index, but also on how a pigment will behave in the customer's actual system.

Because the right pigment is not simply the one with the right number.

It is the one that works in the right application, formulation and process.

📩 Looking for PB15:4 for a specific application?
Contact us to discuss the suitable grade.

📬 Email: [email protected]
💬 Telegram / WhatsApp: +86 187 5199 6743
🌐 Official website: en.sanhucolor.com

11/08/2026

https://www.linkedin.com/pulse/why-do-yellow-pigments-fade-faster-than-others-eveline-leksenkova-nt25c

Why yellow shades are often more challenging in terms of lightfastness - and what technologies can help preserve color Yellow may seem like one of the simplest colors. From a pigment chemistry perspective, however, it is much more complicated.

10/08/2026

Why Is White Plastic Harder to Color Than Red?

At first glance, white seems like the easiest color to produce.
In plastic applications, however, the opposite can often be true.

White can require much tighter control than bright red, blue, or green.

Why?

🔹 1. White reveals inconsistencies
Small differences in shade, opacity, or pigment distribution can be much more visible on a white surface. What may go unnoticed in a deep, saturated color can become obvious in white.

🔹 2. Opacity matters as much as color
A stable white is not simply about achieving the right shade. The pigment must effectively hide the substrate, making opacity and pigment performance critical factors.

🔹 3. Dispersion is crucial
Poor pigment dispersion can lead to uneven appearance, reduced opacity, and local color variations.

🔹 4. The polymer matters too
The type of polymer, fillers, transparency, and even the thickness of the plastic part can affect how white is perceived.

🔹 5. Small deviations become visible
In white plastics, it is not enough to achieve “white.” The goal is consistent white - from batch to batch and throughout the production process.

That is why pigment selection should go beyond simply matching the color.
For plastics, factors such as:
→ Dispersion
→ Opacity
→ Particle size
→ Heat resistance
→ Polymer compatibility
→ Color consistency
all matter.

:
White may look like the absence of color, but in industrial plastics, achieving a clean and consistent white can be one of the more demanding color challenges.

At Sanhu Color, we look beyond the shade - we consider how a pigment will perform in the actual application.

📧 [email protected]
🌐 en.sanhucolor.com

07/08/2026

Why Asking the Right Technical Questions Speeds Up Every Project

A few days ago, we at Sanhu Color received an inquiry for a red pigment.

At first glance, everything seemed straightforward. The customer provided the Color Index, the estimated purchase volume, and requested a quotation.

Instead of sending a price immediately, we asked a few additional questions:
• What application is the pigment for?
• Is it a water-based or solvent-based system?
• What level of heat resistance is required?
• Will the final product be used indoors or outdoors?
• How important are light fastness and weather resistance?

The answers completely changed the recommendation.

The pigment originally requested matched the target shade, but it wasn't the best choice for the customer's application. It would likely have failed during performance testing, leading to additional sample requests, more lab work, and weeks of unnecessary delays.

By spending just a few extra minutes asking technical questions upfront, our team at Sanhu Color was able to narrow the selection to pigments that actually met the application's requirements.

The result?
✔ Fewer unsuitable samples
✔ Fewer rounds of testing
✔ Faster technical approval
✔ A shorter path to production

Sometimes customers worry that suppliers ask too many questions before providing a quotation.

In reality, a good technical supplier isn't trying to complicate the process - they're trying to eliminate problems before they happen.

In the pigment industry, the same Color Index doesn't always guarantee the same performance. Dispersion, heat stability, light fastness, processing conditions, and the final application all matter.
That's why understanding the application is often far more valuable than simply matching a color.

At Sanhu Color, we believe that good pigment selection starts with understanding the customer's process - not simply matching a Color Index number.

What technical questions do you expect a pigment supplier to ask before recommending a product?
________________________________________

Have a Technical Question About Pigments?
We'll help find the right solution for your application.

📧 [email protected]
📱 WhatsApp / Telegram: 187 5199 6743

05/08/2026

Pigment Orange 13 - A Bright Pigment for Printing Inks and Coatings

When selecting an orange pigment, vivid color is only part of the equation. Consistent shade, good dispersibility, and reliable processing performance are equally important for stable production.

SH12W-PO13, based on Pigment Orange 13 (C.I. P.O.13), combines a bright orange shade with reliable performance characteristics, making it suitable for a variety of industrial applications.

Key Properties

🟠 pH: 6-7

🟠 Oil Absorption: 40-45 g/100 g

🟠 Heat Resistance: 160 °C

🟠 Light Fastness: 5

🟠 Resistance to Water, Linseed Oil, Acid and Alkali: 4

Typical Applications

✔ Water-based printing inks

✔ Water-based coatings

✔ Solvent-based coatings

✔ Potential use in textile printing

Selecting the right pigment involves more than choosing the right shade. Matching the pigment to your application helps improve process stability, color consistency, and overall production efficiency.

Questions about pigments?

The Sanhu Color team is ready to help you select the right grade, provide technical information, and arrange product samples.

📬 Email for inquiries & specifications: [email protected]

💬 Telegram / WhatsApp: +86 187 5199 6743

🌐 Official website: en.sanhucolor.com

04/08/2026

https://www.linkedin.com/pulse/five-questions-ask-pigment-supplier-before-your-first-leksenkova-udhfe

A practical guide to reducing risks in quality, color consistency and supply Choosing a pigment supplier is not only about finding the lowest price per kilogram. At first glance, two suppliers may offer the same pigment with the same Color Index number - for example, Pigment Yellow 13 or Pigment Blu

03/08/2026

How Film Thickness Changes Color Perception

The short answer: the thickness of a colored film affects how we perceive its color because it changes how much light travels through the material. The thicker the layer, the deeper, darker, and more saturated the color appears.

🔹Think of the ocean

Near the shore, the water looks almost transparent. A little farther out, it turns turquoise. In deeper water, it appears dark blue.
The water itself hasn't changed - only the depth that light travels through.

The same principle applies to paints, printing inks, and transparent colored plastics.

🔹Why does this happen?

As light passes through a colored material, part of it is absorbed by the pigment.
The thicker the film, the longer the light travels inside the material, and the more light is absorbed. As a result, the color appears richer and more intense. This behavior is described by the Beer-Lambert law.

In addition, some pigments may show a slight shade shift as film thickness changes. This is why two coatings made from the same formulation can still appear different if they are applied unevenly.

🔹Why does it matter?

Film thickness influences the final appearance in many pigment applications:
• Printing inks - even small variations in ink film thickness can lead to visible color differences.
• Coatings - thicker films often appear darker and more saturated.
• Plastics and packaging – thicker sections of a transparent colored part usually look darker than thinner areas.

🔹The takeaway: Color is determined by more than just the pigment formula. Film thickness, substrate, application method, and lighting all influence the final appearance. That's why pigments should always be evaluated under real application conditions - not just on a laboratory drawdown.

KnowledgeLab by Sanhu Color

Helping manufacturers make better pigment decisions through practical technical insights.

If you're looking for the right pigment for your application or need technical support, we're here to help.

📧 [email protected]
🌐 en.sanhucolor.com

03/08/2026

What Happens After You Send an Inquiry to Sanhu Color?

When sourcing pigments, the inquiry is just the beginning.
Behind every quotation is a process designed to help customers find the most suitable solution for their application - not simply the closest color.

Here's what happens after we receive your request:

1️⃣ Understanding Your Requirements

We start by learning more about your application.
Is the pigment intended for coatings, printing inks, plastics, or another industry? What performance is required? Heat resistance, light fastness, chemical resistance, dispersion characteristics - all of these factors influence the recommendation.

2️⃣ Selecting the Right Grade

Our sales and technical teams review your requirements and identify the most suitable pigment from our portfolio.
If you're currently using another supplier's product, we can also recommend an equivalent grade that matches your application as closely as possible.
Technical documentation, including TDS and SDS, is provided for evaluation.

3️⃣ Sample Evaluation

Before moving to production, customers can evaluate the pigment in their own formulation.
Testing in real production conditions is often the best way to confirm that a pigment delivers the expected performance.

4️⃣ Quotation & Logistics Planning

Once the product is confirmed, we prepare the commercial quotation together with suitable shipping terms, packaging options, and delivery arrangements to ensure the most efficient supply.

5️⃣ Quality Control Before Shipment

Every production batch is checked against established quality standards before shipment.
A Certificate of Analysis (COA) is provided so customers know exactly what they will receive.

6️⃣ Ongoing Technical Support

Our work doesn't end when the shipment leaves the factory.
Whether you need technical information, documentation, or support during product evaluation, we're always ready to help.
At Sanhu Color, we believe that supplying pigments means more than delivering color.

It means understanding our customers' processes and helping them achieve reliable, consistent results.

What do you value most when choosing a pigment supplier - technical support, consistent quality, fast delivery, or something else? We'd love to hear your thoughts in the comments.

Contact for Inquiries & Sample Requests

Looking for the right pigment for your application?
Our team is ready to help with product selection, technical documentation, and sample requests.

📧 [email protected]
📱 WhatsApp / Telegram: +86 187 5199 6743
🌐 en.sanhucolor.com

Sample requests are available for product evaluation.

29/07/2026

Meet Pigment Red 53:1 - A Bright Red for Water-Based Systems

When choosing a red pigment for water-based applications, shade is only part of the equation.

The pigment also needs to disperse easily, provide consistent color from batch to batch, and fit efficiently into the production process.

SH04W-PR531Y, based on Pigment Red 53:1 (Lake Red C), is developed specifically for water-based systems, delivering a bright yellow-shade red with reliable performance across a wide range of applications.

It is suitable for:
- Water-based paints
- Water-based printing inks
- Pigment textile printing

Why manufacturers choose SH04W-PR531Y
✔ Yellow-shade red for vibrant color development
✔ Good dispersibility in water-based formulations
✔ Consistent color performance during production
✔ Cost-effective solution for conventional industrial applications

Every formulation has its own requirements, and selecting the right pigment grade can make a noticeable difference in processing efficiency and the quality of the finished product.

At SANHU COLOR, we help customers choose pigment grades that match their application - not just the desired color, but the performance their production demands.

The right pigment is more than a color. It's part of a reliable production process.

Sanhu Color - Your Reliable Partner in Industrial Pigments

👩‍💼 Your Contact: Eveline
📧 [email protected]
💬 WhatsApp / Telegram: +86 187 5199 6743
🌐 en.sanhucolor.com

🚚 Looking for the right pigment? Contact us for technical support or request a free sample.