Methods and hair treatment products for smoothing or straightening hair having a formulation including at least one reducing agent, at least one protein fraction, at least one emollient, at least one emulsifier; and an aqueous diluent. of the Au layer, and temperature of a sample is raised to reach and exceed the melting point of the Au layer so that the Au layer is dissolved. The unit relies on a smartcard, which has a personalized key that unlocks encrypted content. The top portion of the substrate can be a conductive layer separated from the memory device by the SOI-oxide insulator film.