My teacher said blue litmus paper stays blue in acids. I checked wikipedia and it said that blue litmus paper changes red in acids. I don't know what to believe Oh and can the blue litmus paper read bases or can it only read acids?

It depends on the color of the paper to begin with. Obviously if you start out with a piece of blue paper you couldnt have blue mean anything or else you wouldnt be able to see it.

To identify whether the substance is acid, you should use blue litmus since the color changes into red. To test for base, use red litmus because it changes into blue. You can't observe changes if do the other way around, like what spikerz66 said.

aciD = reD

 

Blue = Base

 

 

a simple way to rem

Thanks for your help. My teacher just gave me the wrong information and i had serious doubts of it. The test didn't have nothing on litmus paper results anyways

nice.