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Words written on paper using aqueous ammonium thiocyanate, NH4SCNò are invisible. When the paper is brushed with aqueous iron (Ill) chloride; the words appear blood-red in colou

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Page 1: Words written on paper using aqueous ammonium thiocyanate, NH4SCNò are invisible. When the paper is brushed with aqueous iron (Ill) chloride; the words appear blood-red in colou
Page 2: Words written on paper using aqueous ammonium thiocyanate, NH4SCNò are invisible. When the paper is brushed with aqueous iron (Ill) chloride; the words appear blood-red in colou
Page 3: Words written on paper using aqueous ammonium thiocyanate, NH4SCNò are invisible. When the paper is brushed with aqueous iron (Ill) chloride; the words appear blood-red in colou
Page 4: Words written on paper using aqueous ammonium thiocyanate, NH4SCNò are invisible. When the paper is brushed with aqueous iron (Ill) chloride; the words appear blood-red in colou
Page 5: Words written on paper using aqueous ammonium thiocyanate, NH4SCNò are invisible. When the paper is brushed with aqueous iron (Ill) chloride; the words appear blood-red in colou
Page 6: Words written on paper using aqueous ammonium thiocyanate, NH4SCNò are invisible. When the paper is brushed with aqueous iron (Ill) chloride; the words appear blood-red in colou
Page 7: Words written on paper using aqueous ammonium thiocyanate, NH4SCNò are invisible. When the paper is brushed with aqueous iron (Ill) chloride; the words appear blood-red in colou
Page 8: Words written on paper using aqueous ammonium thiocyanate, NH4SCNò are invisible. When the paper is brushed with aqueous iron (Ill) chloride; the words appear blood-red in colou
Page 9: Words written on paper using aqueous ammonium thiocyanate, NH4SCNò are invisible. When the paper is brushed with aqueous iron (Ill) chloride; the words appear blood-red in colou
Page 10: Words written on paper using aqueous ammonium thiocyanate, NH4SCNò are invisible. When the paper is brushed with aqueous iron (Ill) chloride; the words appear blood-red in colou