DPS (C6H12NaO3S3) N,N-Dimethyl-dithiocarbamyl propyl sulfonic acid, sodium salt CAS No. 18880-36-9 Appearance: Luster white flake crystal Assay:â?¥98% Application: As brightener in acidic Copper baths and has the effect of depositing a bright and ductile coating when combining with polyethers and wetting agents. A combination with other sulfur-containing brightening additives is also possible. For the chemical deposition of precious metals, DPS is used as a stabilizer to prevent wild deposition.