The best replacement for ferric chloride is alum.

The best alternatives to ferric chloride are rated as following:
★★★★★  alum
★★★★★  ferric sulfate
★★★★  ferrous chloride
★★★★  aluminum sulfate
★★★  sodium persulfate
★★  muriatic acid
★  ammonium persulfate

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Speaking about ferric chloride, one probably shouldn't forget about phenol.

Other search terms related to ferric chloride and their ratings are:
★★★★★ phenol
★★ salicylic acid
★★ copper
★★ acetic acid
★ resorcinol
★ thymol
catechol
1% phenol
naphthol
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ferric chloride
alum
ferric sulfate