Lead nitrate is colorless, as are zinc ions. So it doesn't "turn into" any color.
Strontium nitrate will turn a flame red
When testing silver nitrate, a whitish color will yield positive results. If the test is negative, the color will turn clear and it will remain transparent.
It turns a green colour
If lipids are present, the solution will turn a purple/violet color.
In a neutral solution litmus has a purple color.
orange
Bases turn turmeric into red color, whereas acids and neutrals do not have any affect on the solution (it remains yellow in color).
Red color in acidic solutions and blue color in basic solutions.
purple
blue
Lead iodide can be obtained as a yellow precipitate by reacting solutions oflead(II) nitrate and potassium iodide the other compound created by the reaction is potassium nitrate which is a white power but as it is soluble it does not form a precipitate. 2KI + Pb(NO3)2 --> 2KNO3 + PbI2 the balanced equation if you were needing it
im thinking it would turn red:)