( 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 anthracene powder. It is true ultra-violet lamp was used but there is no evidence as to the result to be expected when ultra-violet rays are applied. The complainant has merely deposed that when Vithaldas gave Rs. 100/10 notes of Rs. 10/each to the complainant powder was applied and the Jamadar put them in his pocket. He does not speak of any demonstration being given at that time. According to this witness when the police party arrived at the house of the appellant the Saheb asked the accused about the money and then applied light to his hands and the witness saw the powder which was shining and greenish. As regards the Jhaba the complainant merely says that the Jamadar held the Jhaba in his hands and looked inside the pocket. The complainant does not say that he noticed anything on the Jhaba. The complainants brother Kakandia has deposed that at the Society the Jamadar applied something to the notes and said that it was powder. The witness does not speak of any demonstration or experiment having been made. He was only told that powder had been applied. He deposed that the hands of the appellant were examined but did not say what the result of the examination was. He does not speak of alleged examination of the Jhaba under ultra-violet light. According to the Panch Kanchanlal when the first Panchnama was made powder was applied to the 10 notes which were put in the pocket of Kadva. He does not speak of any demonstration or experiment having been made. According to the witness when the Saheb was the hands of the appellant with the lamp they had something like powder marks. When the Jhaba was examined powder like markes were also seen in the pocket. According to the Panch Jamnadas when the Police Officer applied to the notes he showed them to the witness in the light of ultra-violet lamp. The witness found some stains and some light change of colour. The stains were neither bright nor faint. When then hands of the appellant were seen in the light of the ultra-violet lamp he saw stains on his hands of the type which he had seen on the notes. When he saw the Jhaba in the light of the lamp he saw stains in the pocket of the Jhaba. Even the Police Inspector Gohil has not stated how the presence of anthracene powder could be detected. He merely deposed that Head Constable Jaswantsinh explained the working of the lamp to the Panchas and applied anthracene powder to the notes and then showed them to the Panchas. But he had not deposed as to what he had seen under the light of the lamp. According to this Police Inspector when the hands of the appellant were seen with the lamp he saw marks of powder. When the pocket of the Jhaba was examined it had powder marks. It is therefore not clear from the evidence of these witnesses as to whether they understood the method of d