What material is the scarlet letter with white border?

What material does the red letters with white edges look good with? The scarlet letter on the white edge looks good with these materials:

1, enamel: enamel is a common sticker material, which is durable and easy to paste. You can choose a white adhesive background color and then print red characters on it, which will not only produce contrast, but also make the font more eye-catching.

2. Acrylic: Acrylic is a transparent plastic material with good weather resistance and visual effect. You can choose to paste a white background on the acrylic board, and then draw letters with red acrylic pigment or print them directly, which can create bright and interesting effects.

3. Metal: Metal plates are often used to make signs and signs, with high texture and durability. You can choose a white metal plate as the background and use red metallic paint or screen printing process to display letters, which can produce a modern and industrial style effect. Materials refer to substances used for forming objects, manufacturing products or processing. It can be natural, such as wood, stone, metal ore, etc. Or man-made, such as plastics, alloys, ceramics, etc.