Milk has a pH level of 6.7, so it is slightly acidic. If you dip pH paper inside milk it will probabally go light green.
orange
It would turn Green
yellow
blue
The color become blue.
dark green
blue
blue
Blue litmus paper will likely remain blue when dipped in spinach as spinach is not acidic enough to cause a color change to red.
Blue litmus turns red.
It turns red because rainwater is slightly acidic and litmus turns red in the presence of acids
Milk of magnesia is chemically known as magnesium hydroxide. Although this compound isn't very water soluble, the small amount that does dissolve acts as a base. Thus, milk of magnesia is somewhat basic, and litmus paper would turn blue if exposed to it. Nice....