1. the study of the acid level up as a mixture of fruit juice.2. a study of the corrosion resistance ability, mixed fruit juice, filled with salt water to dissolve and eliminate the stain on the coins.
1. determine the pH level. Of juice to mix together 2. Study on corrosion of the juice mixture. Then add the salt Melt water and the ability to remove stains on the coin.
1. Study on the pH value. Of juice mixed together 2.? Study on the corrosion of the juice can be mixed together, then add salt dissolved in water and the ability to remove stains on the coins.