The color of gelatin empty capsules can be produced in several ways, depending on the desired outcome. Here are some methods commonly used to create colored gelatin capsules:

Pre-colored gelatin: Manufacturers can purchase pre-colored gelatin that is specifically formulated for capsule production. This gelatin is already colored and is available in a range of hues.

Pigment blending: Pigments can be blended into gelatin during the capsule production process. This method allows for more precise color matching and customization.

Dyeing: Dyeing involves soaking the gelatin capsules in a dye solution until the desired color is achieved. This method can be time-consuming and may result in inconsistent coloring.

Coating: Capsules can also be coated with a colored film to achieve the desired hue. This method allows for greater control over the color intensity and can result in a more uniform appearance.

The specific method used to color gelatin capsules will depend on various factors, including the desired color, production capabilities, and cost considerations. It is important to note that the color of gelatin capsules may vary slightly between batches, due to variations in raw materials, production processes, and other factors.