The best replacement for semi permanent is permanent hair color.

The best alternatives to semi permanent are rated as following:
★★★★★  permanent hair color
★★★★  demi permanent
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★  rinse
★  demi
★  temporary hair dye
★  demi permanent hair dye
★  permanent colour
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  permanent black hair dye
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Your alternative for semi permanent is not listed? Suggest!
Speaking about semi permanent, one probably shouldn't forget about developer.

Other search terms related to semi permanent and their ratings are:
★★★★★ developer
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