我国已成为中性笔的生产和销售大国，但技术含量较高的中性墨水仍主要依赖进口。
Although China was the major manufacture of ball-point pens in the world, the gel pen ink which was in high technology is still rely on importing so far.
色精主要用在：木器涂料、皮革涂料、纸张涂料、纸张着色、印刷油墨、中性墨水、低温烤漆等等。
Metal complex solvent dyes: wood stains, leather, paper, printing, neutral ink, low temperature baking paint etc.
结果表明：添加OP与FSO复配的表面活性剂不但可以将中性墨水的表面张力调节到适当范围，而且改善了中性墨水黏度的稳定性。
The results indicate that with the composite surfactant of OP and FSO, the surface tension of the gel ink can be adjusted to the appropriate value, and the viscosity stability is improved effectively.
通过化学法和TLC法可以确定签字笔墨水是水性还是中性；
Water ink and gel ink can be differentiated through chemical method and TLC.
媒材：针笔、银色中性笔、代针笔、水性彩色铅笔、彩色墨水。纸。
Materials: rapidograph, silver gel pen, water color pencil, colored ink, paper.
媒材：针笔、银色中性笔、代针笔、水性彩色铅笔、彩色墨水。纸。
Materials: rapidograph, silver gel pen, water color pencil, colored ink, paper.
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