got HNO3? some acid? - neutralise using NaOH "Yang" <redondoself from gmail.com> wrote in message news:1161920815.218817.157860 from e3g2000cwe.googlegroups.com... > Hi,guys! I need your help! > I recently purified a protein. It is in yellow color. > What does the color mean? > Thank you in advance! >