石色一般为灰白色、也偶有色青而黑的。
有机亲水铝箔表面为天蓝色，无机亲水涂层表面为灰白色或亚白色。
Organic hydrophilic foil surface is sky blue, inorganic hydrophilic foil is grey white or sub-white.
移植治疗无菌性角膜溃疡术后，1~2周有新生血管侵入组织工程角膜基质植片边缘，植片为灰白色半透明状；
From the 1st week to the 2nd week after transplantation, the implant's margin of tissue engineering cornea stromas were invasioned by new vessels and became grey and semitransparent;
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