To test the efficiency of ServeCo Ink & Stain Stick against UNITERS Leather Master Ink Lifter in removing ink from leather.
Date Run:
01/22/2025
Experiment Procedure:
Six leather swatches were cut into uniform rectangular samples and divided into two groups, with three swatches assigned to each ink remover. Initial colorimeter measurements were taken using a BYK-Gardner Colorimeter to record L* (lightness), a* (red/green value), and b* (blue/yellow value) before staining (Unstained Fabric), after staining with ink (Untreated Stain), and after treating the stain with the product (Treated Stain).
A black permanent marker was applied to the center of each swatch to create consistent ink stains across all leather samples. Each product was applied to its respective leather swatches directly onto the stained area by the same evaluator using five complete circular motions, followed by a 30-second wait to allow the product to penetrate. The stain was then lightly dabbed once with a clean cloth to remove residual product and any ink loosened by the treatment.
The performance of each ink remover was evaluated instrumentally using the Stain Removal Index (SRI), a scale from 0 to 100, where 0 indicates no stain removal and 100 represents complete stain removal. The SRI was calculated as:
SRI=100×(ΔE∗(US−UF)−ΔE∗(TS−UF))
Where:
UF = Unstained fabric area
US = Untreated stain area
ΔE(US-UF)* = Color difference between the untreated stain and the unstained fabric
ΔE(TS-UF)* = Color difference between the treated stain and the unstained fabric
The value ΔE (absolute color difference) is calculated as:
ΔE* = √ΔL*2+ Δa*2+ Δb*2
Where:
L = reflectance
a = redness/greenness
b = yellowness/blueness
Trial Results:
Product
Measurement
L
a
b
ΔE*
SRI
Overall SRI
ServeCo Ink & Stain Stick
Unstained Fabric (UF)
28.79
5.83
6.73
8.59
7.67
7.04
Untreated Stain (US)
22.18
3.46
1.78
Treated Stain (TS)
23.42
3.89
1.61
Unstained Fabric (UF)
28.36
5.78
6.74
7.58
7.10
Untreated Stain (US)
22.88
3.58
1.99
Treated Stain (TS)
23.61
4.14
1.72
Unstained Fabric (UF)
28.24
5.76
6.51
7.92
6.35
Untreated Stain (US)
22.12
3.81
1.88
Treated Stain (TS)
23.71
4.79
2.17
UNITERS Leather Master Ink Lifter
Unstained Fabric (UF)
28.31
5.73
6.49
5.94
6.93
5.82
Untreated Stain (US)
23.64
4.41
3.06
Treated Stain (TS)
23.17
4.19
2.11
Unstained Fabric (UF)
28.23
5.8
6.77
7.52
5.34
Untreated Stain (US)
22.56
4.37
2.04
Treated Stain (TS)
24.17
4.90
3.42
Unstained Fabric (UF)
28.14
5.75
6.58
7.47
5.19
Untreated Stain (US)
22.53
4.16
1.91
Treated Stain (TS)
24.44
4.62
3.12
ServeCo Ink & Stain Remover removed more of the ink stain than UNITERS Leather Master Ink Lifter visually and based on SRI calculations after one treatment on each leather surface.
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
ServeCo Ink & Stain Stick performed better than UNITERS Leather Master Ink Lifter at removing ink from leather substrates.
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