Penetration Metric
Comparison between the amount of dye or ink on the face of a fabric and the amount that appears on the back quantifies the depth of migration. The strike through ratio indicates how well the coloring agent has traveled through the thickness of the textile. Elevated penetration means the color is almost as intense on the reverse side as it is on the front.
High penetration is often desired for scarves or flags where the design must be visible from both sides.
Substrate Influence
Porosity and the weight of the material determine the natural resistance to fluid movement. A low strike through ratio is typical for heavy upholstery fabrics or coated materials where surface stay is the goal. For thin silks or polyesters, the ink travels easily between the fibres.
Controlling the tension and the heat during the drying phase helps manage how much liquid is pulled toward the back.
Penetrants or wetting agents are added to the chemistry to increase the strike through ratio when full penetration is required. Conversely, thickeners and anti migrants keep the color on the surface. Digital printing on pretreated fabrics allows for a high degree of control over this ratio by adjusting the droplet volume. Measuring the color values on both sides of the cloth provides an objective numerical value for the ratio. Visual Assessment
Inconsistent penetration leads to a mottled appearance on the reverse side. Proper strike through ratio management ensures that the product meets the aesthetic requirements of the final garment or accessory.
