The table below shows the pH of four body fluids and the resulting color when each
is tested with Red and Blue Litmus Paper. (AKS 6d)
Body fluid
PH
Red litmus
Blue litmus
Blood
7.4
Turns blue
No change
Bile
8.2
Turns blue
No change
saliva
6.8
No change
Turns red
Gastric juice
No change
Turns red
According to the data what kind of substance is gastric juice?