Aqueous Antiseptic Solution and Compatible Anionic Dye for Staining Skin

1 . An aqueous antiseptic solution comprising an aqueous solution of chlorhexidine or a salt thereof, an anionic dye in an amount sufficient to stain a patient's skin when applied, and a cationic excipient.

2 . The aqueous antiseptic solution of claim 1 , wherein the salt of chlorhexidine comprises at least one of gluconate, acetate, chloride, bromide, nitrate, sulphate, carbonate, and phosphanilate.

3 . The aqueous antiseptic solution of claim 1 , wherein the concentration of the chlorhexidine or the salt thereof is from 2.0% w/v to 6.0% w/v.

4 . The aqueous antiseptic solution of claim 1 , wherein the concentration of the chlorhexidine or the salt thereof is 2.0% w/v.

5 . The aqueous antiseptic solution of claim 1 , wherein the anionic dye comprises at least one of Food, Drug, and Cosmetic (FD&C) Blue No. 1, FD&C Blue No. 2, FD&C Green No. 3, FD&C Red No. 3, FD&C Blue No. 1, FD&C Red No. 40, FD&C Yellow No. 5, and FD&C Yellow No. 6.

6 . The aqueous antiseptic solution of claim 1 , wherein the concentration of the anionic dye is from 0.07% w/v to 0.15% w/v.

7 . The aqueous antiseptic solution of claim 1 , wherein the cationic excipient comprises at least one of cetylpyridinium chloride, hexadecyl trimethyl ammonium bromide, benzethonium chloride, and benzalkonium chloride.

8 . The aqueous antiseptic solution of claim 1 , wherein the minimum molar ratio of the cationic excipient to the anionic dye is based on the charge ratio between the cationic excipient and the anionic dye.

9 . The aqueous antiseptic solution of claim 1 , wherein the aqueous antiseptic solution further comprises a surfactant.

10 . The aqueous antiseptic solution of claim 9 , wherein the surfactant is polyvinyl pyrrolidone

11 . The aqueous antiseptic solution of claim 9 , wherein the concentration of the surfactant is from 0.5% w/v to 5.0% w/v.

12 . The aqueous antiseptic solution of claim 1 , wherein the aqueous antiseptic solution further comprises a solubilization aid.

13 . The aqueous antiseptic solution of claim 12 , wherein the solubilization aid comprises at least one of polyethylene glycol and glycerol.

14 . The aqueous antiseptic solution of claim 12 , wherein the concentration of the solubilization aid is from 1% v/v to 49% v/v.

15 . A method of disinfecting a patient's skin comprising applying the aqueous antiseptic solution of claim 1 to the patient's skin.

16 . An aqueous antiseptic solution comprising an aqueous solution of from 2.0% w/v to 6.0% w/v of chlorhexidine or a salt thereof, from 0.07% w/v to 0.15% w/v of an anionic dye, and a cationic excipient, wherein the minimum molar ratio of the cationic excipient to the anionic dye is based on the charge ratio between the cationic excipient and the anionic dye.

17 . The aqueous antiseptic solution of claim 16 , wherein the salt of chlorhexidine comprises at least one of gluconate, acetate, chloride, bromide, nitrate, sulphate, carbonate, and phosphanilate.

18 . The aqueous antiseptic solution of claim 16 , wherein the anionic dye comprises at least one of Food, Drug, and Cosmetic (FD&C) Blue No. 1, FD&C Blue No. 2, FD&C Green No. 3, FD&C Red No. 3, FD&C Blue No. 1, FD&C Red No. 40, FD&C Yellow No. 5, and FD&C Yellow No. 6.

19 . The aqueous antiseptic solution of claim 16 , wherein the cationic excipient comprises at least one of cetylpyridinium chloride, hexadecyl trimethyl ammonium bromide, benzethonium chloride, and benzalkonium chloride.

20 . The aqueous antiseptic solution of claim 16 , wherein the aqueous antiseptic solution further comprises a surfactant.

21 . The aqueous antiseptic solution of claim 16 , wherein the aqueous antiseptic solution further comprises an solubilization aid.

22 . A method for preparing an aqueous antiseptic solution having a compatible dye, the method comprising adding to an aqueous solution of chlorhexidine or a salt thereof: an anionic dye and a cationic excipient, wherein the anionic dye is provided in an amount such that the aqueous antiseptic is capable of staining a patient's skin when applied.

23 . The method of claim 22 , wherein the concentration of the chlorhexidine or the salt thereof is from 2.0% w/v to 6.0% w/v.

24 . The method of claim 22 , wherein the concentration of the anionic dye is from 0.07% w/v to 0.15% w/v.

25 . The method of claim 22 , wherein the minimum molar ratio of the cationic excipient to the anionic dye is based on the charge ratio between the cationic excipient and the anionic dye.

26 . A method of providing an aqueous antiseptic solution and a compatible dye, the method comprising:

providing an aqueous solution of chlorhexidine or a salt thereof;

providing an anionic dye, wherein the anionic dye is provided in an amount that when combined with the aqueous solution of chlorhexidine or the salt thereof an antiseptic solution is provided that is capable of staining a patient's skin when applied; and

providing a cationic excipient.

27 . The method of claim 26 , wherein the concentration of the chlorhexidine or the salt thereof is from 2.0% w/v to 6.0% w/v.

28 . The method of claim 26 , wherein the minimum molar ratio of the cationic excipient to the anionic dye is based on the charge ratio between the cationic excipient and the anionic dye.

29 . The method of claim 26 , wherein the aqueous solution of chlorhexidine or a salt thereof is provided in at least one ampoule and the anionic dye and the cationic excipient are provided in at least one porous element of a liquid applicator, wherein the at least one porous element is positioned such that the aqueous solution of chlorhexidine or a salt thereof flows through the at least one porous element when the ampoule is fractured and anionic dye and cationic excipient are transferred to the aqueous solution.