Lead acetate solution is colorless when pure. However, it can appear slightly cloudy or milky white due to the formation of basic lead acetate, which is a white precipitate.

Here's why:

* Lead acetate (Pb(CH3COO)2) is a soluble salt in water.

* Basic lead acetate (Pb(OH)(CH3COO)) is a white solid that can form in solution, especially when the solution is exposed to air or has a high pH.

So, while a freshly prepared lead acetate solution is colorless, it may become cloudy over time due to the formation of basic lead acetate.