When displaying portable boards containing mosaic samples, it's essential to choose materials that not only provide an attractive presentation but also protect the samples and allow for easy viewing by customers. Here are some materials that are suitable for displaying mosaic samples on portable boards:

1. **Wood:** Wooden display boards or easels can provide a classic and rustic backdrop for mosaic samples. Wood can be stained or painted in various colors to complement the mosaic designs. Wooden easels are especially useful for tabletop displays.

2. **Acrylic:** Clear acrylic display stands or holders are an excellent choice when you want to emphasize the mosaic samples without distracting from their colors and patterns. Acrylic is durable and lightweight, making it easy to transport.

3. **Metal:** Metal display stands or frames can lend a modern and industrial look to mosaic samples. Metals like aluminum or stainless steel can be sleek and versatile, allowing the mosaic patterns to take center stage.

4. **Glass:** Glass display cases or shelves can create an elegant and transparent display for mosaic samples. Glass enhances visibility while providing a clean and sophisticated appearance. It's commonly used for higher-end mosaic presentations.

5. **Velvet or Fabric:** Velvet-covered or fabric-covered display boards can add a touch of luxury to mosaic sample displays. The soft texture of velvet or fabric can complement the tactile nature of mosaic tiles and create a visually appealing contrast.

6. **Corkboard:** Corkboard display panels or boards can be covered with cork, allowing mosaic samples to be attached easily using pins or adhesive. This material is suitable for displaying a variety of mosaic designs.

7. **MDF (Medium-Density Fiberboard):** MDF panels can be painted or finished to create a smooth and even surface for mounting mosaic samples. They provide a cost-effective and customizable option.

8. **Customized Combinations:** You can combine multiple materials to create a unique display. For example, an acrylic stand with a wooden base can offer both transparency and stability.

9. **Lighting:** Incorporating LED lighting elements into the display can highlight the mosaic samples and bring out their colors and textures. LED backlighting can create a striking effect.

10. **Custom Framing:** Framing mosaic samples with wood, metal, or acrylic frames can give them a polished and finished appearance. Custom frames can be tailored to the size and style of the mosaic samples.

When selecting the material for displaying mosaic samples on portable boards, consider factors such as the style and theme of the mosaic designs, the durability of the material, ease of setup and transport, and the overall aesthetic you wish to achieve. The chosen material should enhance the visual impact of the mosaic samples and make them accessible for viewing by customers and clients.