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Views: 0 Author: Site Editor Publish Time: 2026-03-18 Origin: Site
Among black fabrics, "Arabian Black" is undoubtedly the most typical. The depth of "Arabian Black" is difficult to achieve with dyes alone; it requires a synergistic combination of dyes and auxiliaries to reach the optimal depth.
Experimental research has achieved varying degrees of depth enhancement by developing complementary dyes and deepening auxiliaries, continuously optimizing the color matching of disperse black and reactive black dyes, developing different color-enhancing agents, and improving the deepening process.
Our company recommends the following formula for matching Arabic Black dye:
Product | Fabric | Process |
Disperse Black PLUS 400% | Polyester | Disperse Black PLUS 400%:6.0% HAc:0.5g/L 130℃*30min |
Reactive Black R-A | Cellulose fiber | Reactive Black R-A 10% o.w.f soda ash 25g/L （room temperature） 80℃*60min |
According to different customer requirements, four deepening agents have been selected for the Arabian Black solution.
Non-silicone deepening agents
FU5623 – bluish deepening agent
FU5624 – reddish deepening agent
Silicone deepening agents
D136 – bluish anti-gloss deepening agent
D673 – reddish deepening agent
| Deepening Agent | Hydrophilicity | Shade | Deepening Effect | Hand feel | Fiber Damage | Dry Rubbing Fastness | Wet Rubbing Fastness |
| Silicone Bluish D136 | Hydrophobic | Bluish | 70% | Soft | ○○ | 3–4 | 4 |
| Silicone Reddish D673 | Hydrophobic | Reddish | 50% | Soft | ○○ | 3–4 | 4 |
| Non-silicone Bluish FU5623 | Hydrophilic | Bluish | 60% | Hard | × | 4 | 3–4 |
| Non-silicone Reddish FU5624 | Hydrophilic | Reddish | 40% | Hard | × | 3–4 | 3–4 |
| Untreated | Hydrophilic | – | – | Hard | × | 4 | 3–4 |
Deepening agents work by coating the surface of fibers or fabrics with a low-refractive-index film of appropriate thickness, such as resin or silicone-based auxiliaries, during finishing. This reduces the material's ability to reflect or scatter light, allowing more visible light to penetrate the fiber interior and thus increasing the apparent color depth of the dyed fabric.
Finishing process:
Solution preparation → One dip one pad on dry fabric (3.0 kgf/cm²) → Stentering / Heat setting (drying at 150–180 °C) → Moisture regain
Selection of Suitable Deepening Agents:
Blackness Deepening + Soft Hand feel
·Bluish shade: Sylic D136
·Reddish shade: Sylic D673
Blackness Deepening + Hydrophilic Effect
Bluish shade: Sylic FU5623
Reddish shade: Sylic FU5624
In the pursuit of extreme color depth, especially on certain fabrics such as polyester, a one-dip one-nip process—even at near-maximum dosage—shows limited improvement in depth. This indicates that the deepening agent has reached its saturation and can no longer enhance color further.
Our company has conducted related research and found that adopting a two-dip two-nip process can elevate the deepening effect to the next level.
Bluish Shade Deepening:
First dip-nip and drying: Non-silicone bluish deepening agent FU5623
Second dip-nip and drying: Silicone-based bluish deepening agent D136
Bluish Shade Deepening:
First dip-nip and drying: Non-silicone bluish deepening agent FU5623
Second dip-nip and drying: Silicone-based bluish deepening agent D136
First dip-nip and drying | Dosage (g/L) | DL | Da | Db | K/S |
Non-silicone FU5623 | 35 | -3.94 | 0.33 | 0.53 | 35.239 |
Silicone-based D136 | 40 | -4.63 | 0.12 | 0.59 | 38.008 |
Second dip-nip and drying | Dosage (g/L) | DL | Da | Db | K/S |
FU5623+D136 | 35+40 | -7.26 | 0.48 | -0.74 | 53.059 |
Standard sample | - | CIE L | CIE a | CIE b | K/S |
0# | - | 15.98 | 0.72 | -0.87 | 23.496 |
The two-dip, two-nip process using the blue brightening agents FU5623 + D136 shows a significant improvement in fabric depth compared to the one-dip, one-nip process, with an enhancement of up to 125%.
First dip-nip and drying | Dosage (g/L) | DL | Da | Db | K/S |
Non-silicone FU5624 | 30 | -3.02 | 0.22 | 1.46 | 31.56 |
Silicone-based D673 | 25 | -3.50 | 0.13 | 0.96 | 33.466 |
Second dip-nip and drying | Dosage (g/L) | DL | Da | Db | K/S |
FU5624+D673 | 35+40 | -6.67 | 0.66 | 2.43 | 47.361 |
Standard sample | - | CIE L | CIE a | CIE b | K/S |
0# | - | 15.98 | 0.72 | -0.87 | 23.496 |
The two-dip, two-nip process using the red deepening agents FU5624 + D673 results in a significant improvement in fabric depth compared to the one-dip, one-nip process, achieving up to 105% enhancement.
If you want to test deepening agent samples for test ,please contact us :info@sylicglobal.com
