Why the white washig gives shiny finish to the walls?

Explanation

1) Slaked lime is prepared by adding water to quick lime.
`CaO+H_(2)O rarr Ca(OH)_(2)+Q`
2) A solution of slaked lime `Ca(OH)_(2)` is used to white wash the walls.
3) Calcium hydroxide reacts with the carbon dioxide in air to form a thin layer of calcium carbonate on the walls. It gives a shiny finish to the walls.
`Ca(OH)_(2)+CO_(2)rarr CaCO_(3)+H_(2)O`