Touch: When you rub the surface of the antique brick with your hand, it should feel heavy and solid, indicating high density and hardness. A lighter or softer touch may suggest lower quality or less durability.

Scratch Test: Try scraping the glaze with a hard object like a metal key. If the surface shows scratches, it means the glaze is weak and not durable. This can lead to staining and difficulty in cleaning after polishing.

Tap Test: Gently tap the surface of the brick with your fingers. A clear, ringing sound indicates that the brick is well-fired and of good quality. A dull or muffled sound may suggest poor sintering, which could mean internal cracks or structural weakness.

Visual Inspection: Examine the cross-section of the brick — it should be dense and uniform. Check the surface for natural reflection and consistent color. The more varied and harmonious the color, the better it suits large-scale installations, creating a visually pleasing and cohesive look. It’s important to ensure the color complements your home's overall design style.

Water Absorption Test: The simplest way to check water absorption is to drop some water on the back of the tile. If the water remains as droplets without spreading, it means the brick has low water absorption and is of high quality. Jinyitao antique bricks have a water absorption rate of less than 0.5%, making them compact and durable.

Stain Resistance: Use a colored pencil to draw on the front of the brick. After a few minutes, wipe it off with a damp cloth. If no marks are left, the brick has excellent stain resistance and is easy to maintain over time.

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