Choosing the Right Acrylic Rainbow Finish: 1+2+1mm vs 2+2mm

The rainbow finish has become an increasingly popular option in acrylic products such as pins, decorative items, and creative accessories. Its dynamic color-shifting effect adds strong visual appeal and elevates the perceived value of a design.

However, the final appearance of a rainbow finish is heavily influenced by the acrylic structure and printing method. Different layer constructions can significantly affect pattern alignment and graphic clarity.

In this article, we compare two commonly used structures to help you choose the most suitable option for your design.

Option 1: 1 + 2 + 1 mm Three-Layer Structure

(Double-sided printing, graphics outside the rainbow finish)

Structure Overview

• Total construction: 1mm + 2mm + 1mm acrylic layers

• The rainbow finish is located in the middle layer

• Double-sided printed graphics are placed outside the rainbow effect

Visual Results

Because the graphics are not covered by the rainbow layer:

• The artwork remains sharp and highly legible

• Colors are accurately reproduced

• Fine details are clearly visible without distortion

Potential Challenges

Due to the three-layer laminated structure:

• Front and back graphics may not align perfectly

• Slight misalignment can occur between the two sides

• Designs requiring extremely precise front/back registration may be affected

Key Advantages

• Rainbow effect does not obscure the design

• Best overall graphic clarity

• Ideal for detailed or intricate artwork

Option 2: 2 + 2 mm Two-Layer Structure

(Double-sided printing, one side inside the rainbow finish)

Structure Overview

• Total construction: 2mm + 2mm acrylic layers

• The rainbow finish is applied to one layer

• One side of the double-sided print sits inside the rainbow effect

Visual Results

Since one graphic layer is viewed through the rainbow finish:

• That side’s artwork is partially obscured by the rainbow layer

• Image sharpness and detail are reduced

• Colors and fine lines may appear less clear due to refraction and reflection

Advantages and Limitations

This structure offers:

• A simpler construction

• Better front/back alignment accuracy

However, it also means:

• The rainbow finish directly affects graphic visibility

• Not recommended for complex or highly detailed artwork on the affected side

Key Limitations

• Reduced clarity on the side covered by the rainbow effect

• Less suitable for precision-focused designs

How to Choose the Right Option

When selecting an acrylic rainbow finish, consider the following guidelines:

• If graphic clarity is your top priority, and slight front/back misalignment is acceptable, the 1+2+1mm three-layer structure is the better choice.

• If alignment accuracy is more critical, and your artwork is simple and bold, the 2+2mm two-layer structure can work well—provided you accept reduced clarity on one side.

Recommended Use Cases

Both structures can be successfully applied across a variety of acrylic products. Choosing the right option depends on how the product is used and viewed:

• Pins & Badges: The 1+2+1mm structure is recommended for pins with detailed artwork, as it preserves graphic clarity without rainbow interference.

• Charms & Decorative Accessories: Either structure can work, but designs with fine details benefit more from the 1+2+1mm option.

• Keychains: The 2+2mm structure is suitable for bold, simple designs where durability and alignment are prioritized over fine detail clarity.

Final Thoughts

The rainbow finish is a powerful visual feature, but more is not always better. Achieving the best result requires balancing structure, clarity, and visual impact.

We strongly recommend producing samples based on your actual design before mass production to ensure the final product meets your expectations.