ðɪs ɹɪˈækʃən ɪz ɹᵻvˈɜːst æt lˈoʊ pˈiː ˈeɪtʃ.  kɹˈɪstɐlˌaɪn hɐz ɐ bɹˈɑːnz kˈʌlɚ ænd ɪz jˈuːzd ɪn dˈɛkɹətˌɪv kˈoʊɾɪŋ wˌɛɹ ɪɾ ɪz nˈoʊn æz məsˈeɪɪk ɡˈoʊld.
This reaction is reversed at low pH.  Crystalline  has a bronze color and is used in decorative coating where it is known as mosaic gold.