A special silica film covers a finger in this undated photo. The silica film is advertised on the Internet as being able to fool office fingerprint check-in systems into thinking an employee has arrived on time. [File Photo: hdzxw.com]

A special silica film that can help white-collar employees check in on time at office has been selling well online recently, reported Fujian-based Straits News on Wednesday.

One of its users is a woman surnamed Liu who works for an advertisement company in Fuzhou, capital of Fujian province. Often late for work, Ms. Liu has suffered heavy fines, paying as much as 200 yuan in October alone.

However, she said her "suffering" ended as soon as she spotted the silica film which help latecomers to fool their office's finger print check-in system. Ms. Liu took her fingerprints with plasticine and mailed them to the designated address.

A week later, she received her silica film. Her colleagues, who wear the silica film over their fingers, can touch the office fingerprint check-in machine, fooling it into thinking Ms. Liu has arrived on time.

The product sells for around 100 yuan each online. A producer of such silica film from Rizhao, Shandong province, said his product will work well for at least one year.

He also said he can make a silica film using a fingerprint sample within one week, and promised to refund the payment if the film doesn't work.

According to the producer, who is nicknamed a hacker of the fingerprint check-in system, his customers are mainly young white-collar workers.