碳素笔芯内油墨主要是由石墨构成的，石墨是自然界中最稳定的物质之一。所以用碳素笔写字不会因保存时间太久，而导致字体变得模糊。
研究证明：四种型号品牌的碳素笔其拉曼光谱有相似之处， 但更有明显的不同；
The Raman spectra obtained in the experiments indicated that four brands of carbon pen have not only similarity but also differentiation.
填写完整、准确、真实的《外国人普通申请表》（须用蓝色或黑色的钢笔或碳素笔填写）。
Fill completely and correctly in Visa and Application Form with black or blue pen or ball-point pen.
填写完整、准确、真实的《外国人居留许可申请表》(须用蓝色或黑色的钢笔或碳素笔填写)。
Fill completely and correctly in Residence Permit Application Form with black or blue pen or ball-point pen.
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