Abstract

Multi-modal artifact metrics as an anti-counterfeitingtechnique is created based on the concept of multi-modalbiometrics. Giving two or more characteristic informationto the artifact can improve the certainty of authenticity andincrease counterfeiting difficulty. To give two-opticalfeature information (color hue and emission intensity) intoceramic products, we developed a new type of glassphosphor. It is a novel approach, because there were fewreports on up-conversion phosphors having different colorhue and emission intensity at each observation point on thematerial by infrared light excitation. By welding a smallamount of phosphor powder onto the surface of ceramics,the certainty of authenticity and difficulty of counterfeitingcould be enhanced than an existing method we proposed.Our study established an appropriate blending ratio of tworare earth oxides for making glass phosphor having twooptical features. Welded glass phosphor powder couldwithstand high temperature (with 800 degrees Celsius fordecorating firing and 1230 degrees Celsius for glaze firing)and emit different color hue and intensity after the firing.This shows our method could have a potential to be usedfor the purpose of verifying the product’s authenticity.

Highlights

  • 1.1 Background and TargetCeramic products made by prestigious as well as well-known potteries or brand holders are highly popular and can be sold at a high price as high-quality accessories

  • The purpose of this paper is to propose the artifact metrics using emission intensity distribution (See Fig. 2) as the characteristic information resulting from glass phosphor particles welded on the surface of products

  • To eliminate the barrier for practical use and realize the method for ceramic products, we propose an approach of putting the light emission of phosphor in the visible light band instead of the IR band

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Summary

Introduction

1.1 Background and TargetCeramic products made by prestigious as well as well-known potteries or brand holders are highly popular and can be sold at a high price as high-quality accessories. Counterfeiters manufacture imitations of these products and sell them to people with low appraisal skills (1). We have developed a technique that can verify the product’s authenticity mechanically with high accuracy to limit people with low appraisal skills to purchase imitations unknowingly. This technique is defined as the artifact metrics (2) because it makes it difficult for forgers to manufacture the genuine product’s clone. We proposed a technique to weld small amount of phosphor powder onto the surface of products It has three features as shown as follows: (1) The powder has low toxicity and does not affect the product’s colors/patterns. It has three features as shown as follows: (1) The powder has low toxicity and does not affect the product’s colors/patterns. (2) The characteristic information (emission intensity) used for verification of authenticity can be extracted from each product in a non-contact manner. (3) It is difficult to manufacture clones using the extracted characteristic information from genuine products

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