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Bronze patination of art nouveau figurine

I have an art nouveau spelter figurine c.1900 which I believe originally had a bronze patina. This has been removed at some time revealing the grey colour spelter. Can anyone advise me how to restore this antique to its original finish.

Sue Robinson
hobbies - Silchester, Reading, UK
2003

Immersion copper for zinc:
copper sulphate ⇦ on eBay or Amazon [affil link] 30 gm
tartaric acid ⇦ on eBay or Amazon [affil link] 50 gm
ammonia ⇦ on eBay or Amazon [affil link] 25 % 50 ccm
water 1 lit dissolve copper sulphate in water,add acid,add ammonia.

Immediately after plating rinse well.Must be waxed or lacquered!

Goran Budija
- Zagreb,Croatia
2003

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