What are acid dyes?

Acid dyes are a type of dye that can dissociate into anions in aqueous solution, and their molecular structure contains acidic groups such as sulfonic acid or carboxyl groups. This type of dye is known for its bright colors, strong coloring power, and good solubility.

The unique advantages of using acid dyes for fertilizer dyeing

-Excellent solubility: easily soluble in water, easy to mix evenly
-Color Brightness: Provides bright and long-lasting color effects
-Strong stability: maintains color in a fertilizer environment without fading
-Economic efficiency: minimal usage, good coloring effect
-High safety: Most varieties are plant and environmentally friendly

Detailed explanation of commonly used chemical fertilizers and acid dyes for dyeing

Acid Blue 9

-Chemical name: C.I. Acid Blue 9
-CAS number: 2650-18-2
-Appearance: Dark blue powder
-λ max: about 630nm
-Solubility: Easily soluble in water, slightly soluble in ethanol

Characteristics of fertilizer application:
-Specially suitable for dyeing nitrogen fertilizers such as urea and compound fertilizers
-The best coloring effect is achieved within the pH range of 4-6
-Recommended dosage: 0.001% -0.005% (adjusted according to the required color depth)

Advantages:
-Excellent light resistance, not easily faded when stored outdoors
-No impact on fertilizer efficiency
-Uniform color, no clumping

 Acidic apple green
-Chemical name: C.I. Acid Green 25
-CAS number: 4403-90-1
-Appearance: Green powder
- λmax：590-640nm
-Solubility: Easily soluble in water

Characteristics of fertilizer application:
-Specially suitable for dyeing potassium fertilizer and compound fertilizer
-Best performance under pH 5-7 conditions
-Recommended dosage: 0.002% -0.008%

Advantages:
-Bright and vibrant colors with high recognition
-Good compatibility with fertilizer components
-Strong weather resistance, no discoloration after long-term storage

Acid Red 3R
-Chemical name: C.I. Acid Red 18
-CAS number: 2611-82-7
-Appearance: Red powder
- λmax：500-540nm
-Solubility: Highly soluble in water

Characteristics of fertilizer application:
-Specially suitable for dyeing phosphate fertilizers and compound fertilizers
-Optimal pH range: 4.5-6.5
-Recommended dosage: 0.001% -0.004%

Advantages:
-Strong coloring power, minimal usage
-Color stability, no migration
-No adverse effects on fertilizer nutrients