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To add further to your question, for a silver diamine dental product (Riva Star by SDI), the white precipitate disappears after applying more potassium iodide to the mixture. The excess solution in the tooth cavity is then rinsed off with water. There is some cool chemistry going on here but I am unsure what it is. Riva Star comes in 2 solutions that are ...

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There is another effect : relativity. In the 6th line of the periodic table (containing $\ce{Tl}$), relativity effect becomes important. Even though electrons have no velocity, their behavior does change as if outer electrons were moving at nearly the velocity of light. This was shown by Pekka Pyyko, Accounts of Chemical Research, Vol.$12$, No. $8, 1979$, p. ...

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It can be explained by fajans' rules. As the positive charge on an atom increases its size decreases as a result polarising power increases. If polarising power increases then it distorts the electron cloud towards itself and hence ionic nature of the bond decreases. This is the reason why Thallium(I) chloride is more ionic than Thallium(III) chloride. ...

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