Blue spotting on white plaster

[fletcher_101]

I'm getting blue spotting on my white plaster. The plaster itself was redone last year and it started getting these blue spots late last summer. Chemistry is normal (chlorine). Its on both the horizontal and verticle surfaces. Anyone know what this is?

 

[Guest]

Please post a full set of test results. Without them we really cannot tell much.

 

[Butterfly]

Have you had your water tested for metals?