Returns a list of molar mixing ratio for each kink between ORIGINAL
        (instead of processed) reactant compositions. This is the
        same list as mixing ratio obtained from get_kinks method
        if self.norm = False.

        Returns:
            A list of floats representing molar mixing ratios between
            the original reactant compositions for each kink.

def get_critical_original_kink_ratio(self):
        """
        Returns a list of molar mixing ratio for each kink between ORIGINAL
        (instead of processed) reactant compositions. This is the
        same list as mixing ratio obtained from get_kinks method
        if self.norm = False.

        Returns:
            A list of floats representing molar mixing ratios between
            the original reactant compositions for each kink.
        """
        ratios = []
        if self.c1_original == self.c2_original:
            return [0, 1]
        reaction_kink = [k[3] for k in self.get_kinks()]
        for rxt in reaction_kink:
            ratios.append(abs(self._get_original_composition_ratio(rxt)))
        return ratios