colloidal silver solution too strong?

hey everyone, following guides here, I have been making colloidal silver. Initially I ran it overnight using a 9v battery but using a tds meter it only gave me 15ppm reading so I let it run again, and it's been 24 hours give or take. My tds meter reads 30ppm now but the solution is too dark which doesn't feel right to me. I did a search and turns out tds meter won't read CS accurately so I'm hoping someone with expertise take a look at the picture and tell me if this solution will be alright to use on my female plant?

Does it look too high in concentration? If it is, will it speed up the process or kill my plant? I intend on using and pollinating the same plant with it. Is there anything I can do to lower the concentration or should I make another batch from scratch? Thanks in advance guys.

P.S. I have already strained it twice through coffee filters and it's still dark like that.