# Color changes of a solution of acetone and sodium hydroxide

I have put acetone and sodium hydroxide solution (approximately $\pu{1M}~ \ce{NaOH}$) in a beaker and didn't see any colour change for a day (actually, it was transparent, no colour).

After almost 2 days, I saw a dark brown colour (no precipitate, just diffused colour). Now (after 25 days) its colour seems black, but when I take a small amount and dilute it with water, it is brown. What chemical compound has formed that has this colour? What reaction has taken place? (I doubt it is an aldol condensation)

• Probably your acetone has polymerized into short chain by a aldol reaction. – Jori Feb 15 '15 at 12:52
• Acetone may have self condensed with itself. As time passed it would have got polymerized too. – TEJKIRAN Feb 15 '15 at 14:39