Save lifting the tank lid and placing food colour in that could stain the bowl under the wrong circumstances. just sprinkle sum talcum powder in the bowl, any leak will show up as a track through the powder.
All advice is given with-out seeing the job, and hence all advice MUST be taken as advice with limited knowledge on the exact situation. NO responsibility can or will be taken. And yes, I am a licensed Plumber and Drainer with my own business in Brisbane Australia.
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