This manuscript reports on compared color evolution about phase transformation of ${alpha}-FeOOH@SiO_2$ and ${eta}-FeOOH@SiO_2$ pigments. Prepared ${alpha}$-FeOOH and ${eta}$-FeOOH were coated with silica for enhancing thermal properties and coloration of both samples. To study phase and color of ${alpha}$-FeOOH and ${eta}$-FeOOH, we prepared nano sized iron oxide hydroxide pigments which were coated with $SiO_2$ using tetraethylorthosilicate and cetyltrimethyl-ammonium bromide as a surface modifier. The silica-coated both samples were calcined at high temperatures (300, 700 and $1000^{circ}C$) and characterized by scanning electron microscopy, CIE $L^*a^*b^*$ color parameter measurements, transmission electron microscopy and UV-vis spectroscopy. The yellow ${alpha}$-FeOOH and ${eta}$-FeOOH was transformed to ${alpha}-Fe_2O_3$ with red, brown at 300, $700^{circ}C$, respectively.