Bleck! The penny's still dirty. Baking soda did not clean the penny. Baking soda is a base. Try cleaning the penny with another substance. CLICK on a cup below. Baking Soda Vinegar Lava Soap Lemon Juice Lesson plans. . .
Shaina /shai-na/ [2 sylls.] as a girls' name is pronounced SHAY-nah. It is of Yiddish origin, and the meaning of Shaina is beautiful.
Definition of patina for English Language Learners. : 1  a thin usually green layer that forms naturally on the metals copper and bronze when they are exposed to the air for a long time. : 2  a shiny or dark surface that forms naturally on something (such as wood or leather) that is used for a long time. : 3  a thin layer.