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Nan'an also picked up an invoice, held it in his hand, only felt that it felt unusually good, he fanned it, and there was a slight strong wind, looking at the strange, looming luster on the invoice, he felt more and more surprised.

Lin Yi picked up an invoice, stretched out his finger and pointed to a few places on it, and said: "These places, there are anti-counterfeiting marks, you take a little higher, and you can see clearly that there are special patterns and words on it when you shine in the sun." ”

When Nan An and Fan Xian heard this, they immediately followed the method Lin Yi said, took the invoice and looked at the sun, and sure enough, they saw patterns and words on it.

In one place, there was a red morning sun, and in another, there were two indecipherable symbols written on it, like words, but they didn't recognize them.

In addition, there are several places with special characters.

This information, in the sun, can be seen very clearly, but as soon as it is taken down, it is immediately invisible.

Fan Xian tried this several times, only to feel surprised, and asked with a strange face: "Mrs. Ji, how did you do this?" Why is it that when you are in the sun, you can see the pattern of the horse, but you can't see it without the sun? ”

Lin Yi glanced at him, smiled slightly, and said, "This is a complex technical issue, and it can't be explained clearly in three or two sentences. ”

Fan Xian was so curious in his heart, but he also knew that Lin Yi didn't want to tell him the secret when he said this, although he wanted to know, he still had to hold back his curiosity.

Lin Yi stretched out his hand and pointed to the invoice in Fan Xian's hand, and said: "On the top of this barcode, there are numbers, which is the number of the barcode. ”

Fan Xian took the invoice, put it in front of him, squinted his eyes for a long time, and said, "What's the matter, where is the number?" I can't see it. ”

Lin Yi smiled and took out a small round mirror from her bag, handed it to Fan Xian, and said, "No, then this small mirror will come out as soon as you look at it." ”

Fan Xian glanced at the small mirror in Lin Yi's hand, and was a little skeptical, but out of trust in Lin Yi, he still reached out and took the small mirror and covered it on the line of barcodes.

Miraculously, there was nothing on the barcode just now, and at this moment, under the magical little mirror, a line of clear text was displayed.

It's simple, refreshing zeros and ones, corresponding to the barcode below, black is one, and white is zero.

Fan Xian subconsciously rubbed his eyes, and then opened his eyes to see, the row of small numbers was still clear, Fan Xian took the small mirror away again, like a trick, the small number disappeared immediately, and so on, the small mirror was like magic, as soon as it was put on, there were words, and when it was taken away, there was nothing.

Fan Xian was amazed in his heart, he held the small mirror, looked up at Lin Yi, and asked in surprise, "Mrs. Ji, what is going on?" Why is it so magical? ”

Fan Xian picked up the invoice and looked at it over and over again, but he didn't find any clues.

When Nan'an heard Fan Xian say this, he was also a little curious, he stretched out his hand to Fan Xian, and Fan Xian consciously handed him the small mirror.

Nan An, like Fan Xian, took a small mirror to look at the barcode, and sure enough, when he saw the numbers on it, he was also surprised in his heart, looked up at Lin Yi, and waited for her answer.

Lin Yi explained: "The number is written in a special material, and under normal circumstances, it is invisible, but it can be seen in a mirror of a special material. ”