Why does the tio2 precipitate become a brownish color when heated in hot air furnace?

We mixed TTIP with water to form Tio2 ppt then mixed with TMAH solution 62.5:1 molar ratio under 100deg celcius ( under stirring), then again dryed it into hot air furnace at 250 deg Celsius and...

18 September 2014 3,490 4 View