( 1 ) THIS is a case in which the Police resorted to the technique of anthracene powder and ultra-violet rays. According to the prosecution anthracene powder was applied to the currency notes and was found on the hands of the appellant This circumstance is sought to be used to prove that the appellant had received the notes. When the prosecution wants to prove the presence of anthracene powder on the hand of the appellant it is the duty of the prosecution to prove by means of expert evidence or books of science the nature of anthracene powder the manner in which its presence can be detected and the tests to be applied for the purpose. The tests must be such that if after they are applied and results are positive the positive results lead to one and one conclusion namely the finding of anthracene powder. It is for the prosecution to prove that positive results are a conclusive proof of the find of anthracene powder. This is a matter on which experts should give evidence. The prosecution can also rely on books of science. In this case the prosecution has not led any evidence of this type as to the nature of anthracene powder and the means of detecting presence anthracen