Compositions, products, system, and method for perming hair

A method of perming mammalian hair comprising steps of:

• a step (a) of applying a first-composition comprising water, cysteamine HCl, and cysteine HCl to at least some of the mammalian hair;
• a step (b) of shaping the at least some mammalian hair by attaching at least one support-structure to the at least some mammalian hair and/or by using at least one off-the-rod setting technique to shape the at least some mammalian hair;
• a step (c) of waiting at least ten (10) minutes while the at least some mammalian hair has been shaped from the step (b) and while the at least some mammalian hair had the first-composition applied to the at least some mammalian hair from the step (a);
• wherein execution of the step (c) is configured to break at least some preexisting disulfide bonds in the at least some mammalian hair;
• a step (d) testing an elasticity of at least one strand of hair selected from the at least some mammalian hair;
• and
• a step (e) of applying a second-composition to the at least some mammalian hair, if the at least some mammalian hair passes the step (d) elasticity test;
• wherein the second-composition is configured to stop the first-composition from breaking any further disulfide bonds in the at least some mammalian hair;
• wherein the at least some of the mammalian hair is not rinsed between application of the first-composition and application of the second-composition;
• or
• repeating the step (b) and the step (c) if the at least some mammalian hair fails the step (d) elasticity test.