Sorry, but there is nothing yet known as a replacement for lead nitrate.

Perhaps your query is too complicated? For example there are alternatives to the following parts of your query:

lead (44)
nitrate (40)

Maybe some reasonable answers will be found next time you come.

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Speaking about lead nitrate, one probably shouldn't forget about sodium iodide.

Other search terms related to lead nitrate and their ratings are:

★★★★★ sodium iodide
★★★★ sodium chloride
★★★★ potassium chromate
★★★ potassium iodide
★★ sodium sulfate
sodium sulfide
sodium bromide
ammonium sulfide
You have in mind a companion for lead nitrate and it is not yet here? Propose!

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lead nitrate