黑曜岩火山玻璃，一般为黑色，带状，摔碎时色泽光亮，表面。
A usually black or banded, hard volcanic glass that displays shiny, curved surfaces when fractured and is formed by rapid cooling of lava.
以此方法制成的笋干不仅色泽光亮、洁白，质地松软，复水性好，且营养味美。
By this way, the drying shoot is not only bright and lustrous, white, soft, restoring water, but also nutritious and tasty.
产品外观：表面光滑，质地均匀，色泽光亮，无裂纹，黑点，和机械损伤的现象。
Product Appearance: the surface is smooth, texture is uniform, colour and lustre is bright, no crack, no dark spots, and no mechanical damage.
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