Introduction: Inaccuracy of previous experiment a We argue that Figureau samples were taken out of the cryostat after the cooling period, then heated and dissolved in HCl solution at room temperature for measurement. Therefore, their observing no optical rotation in solution only proves that Salam phase transition is not an irreversible process But it is not a piece of negative evidence while the transition is reversible Moreover, their work only denied the configuration change from D-cystine to L-cystineIntroduction: Introduction: Inaccuracy of Inaccuracy of previous experiment previous experiment „ We argue that We argue that Figureau Figureau samples were taken out of samples were taken out of the cryostat after the cooling period, then heated the cryostat after the cooling period, then heated and dissolved in and dissolved in HCl solution at room temperature solution at room temperature for measurement. Therefore, their observing no for measurement. Therefore, their observing no optical rotation in solution only proves that Salam optical rotation in solution only proves that Salam phase transition is phase transition is not an irreversible not an irreversible process process, But it is not a piece of negative evidence ut it is not a piece of negative evidence while the transition is reversible while the transition is reversible. Moreover, their work only denied the Moreover, their work only denied the configuration change from D configuration change from D -cystine cystine to L -cystine cystine