i have dipstick indicator can monitor ag ions pollutant aqueous solutions when dipped

I have a dipstick indicator that can monitor Ag+ ions as a pollutant in aqueous solutions. When dipped into a solution with [Ag+] concentration > 1.0 x 10-8 M, the dipstick changes color to indicate presence of the heavy metal and toxic silver(I) ions. Now, I find a sample that is known to have 4.0 x 10-2 M Ag(I), but the solution is also quite loaded with potassium thiocyanate at about 1.20 M. Hmm? Will my dipstick actually change color, indicating that the free Ag ion concentration is > 1.0 x 10-8 M? You must prove your answer.