Bleaching/highlighting composition containing calcium salts
The present invention relates to bleaching composition for keratin fibres, especially human hair, comprising at least one compound with bleaching and/or highlighting effect and a calcium salt. Further object of the present invention is the use of at least one calcium salt in a bleaching and/or highlighting composition for keratin fibres, especially for human hair, comprising at least one compound with bleaching and/or highlighting effect for preventing temperature increase going above 40° C., preferably above 45° C. and more preferably above 50° C. in a period of at least 60 min after mixing water free bleaching and/or highlighting composition and oxidizing lotion.
1. A method for preventing excessive heat development during bleaching and/or highlighting of keratin fibers, comprising the steps of: incorporating 0.1 to 20% by weight, calculated to the total composition prior to mixing, of at least one calcium salt in a bleaching and/or highlighting composition, and applying said composition to the keratin fibers to achieve bleaching and/or highlighting without excessive heat development, wherein the bleaching and/or highlighting composition comprised between 30 to 80 wt. %, calculated to the total composition, of a persulfate compound, and wherein the bleaching composition is water-free and in powder form.
2. The method of claim 1 , further comprising mixing the bleaching and/or highlighting composition with an oxidizing composition, whereby the temperature does not increase above 40° C. in a period of at least 60 min after said mixing.
3. The method according to claim 1 , wherein at least one calcium salt is selected from a group consisting of calcium aluminium borosilicate, calcium aspartate, calcium benzoate, calcium acetate, calcium carbonate, calcium citrate, calcium dihydrogen phosphate, calcium fluoride, calcium hydroxide, calcium lactate, calcium monofluorophosphate, calcium oxide, calcium phosphate, calcium propionate, calcium pyrophosphate, calcium sulphate, calcium nitrate, calcium salicylate, calcium silicate, hydrate, calcium tartarate, tricalcium phosphate, calcium chloride, calcium iodide and calcium bromide.
4. The method according to claim 2 , wherein the composition comprises at least one compound with bleaching effect at a concentration of 5% by weight, calculated to total composition prior to mixing with oxidizing composition.
5. The method according to claim 2 , wherein the composition comprises at least one ammonium salt.
6. The method according to claim 2 , wherein the composition comprises silicone oil and/or mineral oil and/or natural oil as lipophilic ingredient.
7. The method according to claim 2 , wherein the composition comprises polymer.
8. The method according to claim 2 , wherein the composition comprises additionally at least one lipophilic ingredient at a concentration of 1 to 50% by weight calculated to total composition prior to mixing with oxidizing lotion.
9. The method according to claim 1 , wherein the composition comprises additionally at least one lipophilic ingredient at a concentration of 1 to 50% by weight calculated to total composition prior to mixing with oxidizing lotion.
10. The method according to claim 1 wherein the bleaching composition comprises between 40 to 70 wt. %, calculated to the total composition, of a persulfate compound.
11. The method according to claim 1 wherein the persulfate compound is selected from the group consisting of sodium persulfate, potassium persulfate and ammonium persulfate.
12. The method according to claim 11 wherein the persulfate compound is potassium persulfate.