Sanodure Fast Bronze L 
 
 
 
 
Homogeneous, water soluble dyestuff for the adsorptive dyeing of anodised aluminium. 
 
The main applications for Sanodure® Fast Bronze L are:  
 
   - Indoor 
   - Jewellery 
 
Only recommended for interior use. 

1. Dye-specific Data 
 
Commercial form: fine powder, yellow-brown 
Chemical character: Azo-dyestuff, metal complex 
Bulking volume : 500 g/l 
Solubility in water: 100 g/l at 20°C 
Storage stability: practically unlimited, in closed original containers   
Ecotoxicological data: see safety data sheet.  
 
 
2. Application conditions  
 
Concentration, dyeing temperature and time 
 
 Concentration Dyeing temperature Dyeing time 
Bright shades 0.05 - 0.2 g/l 25 - 60°C 10 - 20 min 
Medium shades 0.3 - 0.5 g/l 25 - 60°C 10 - 20 min 
Dark shades 1.0 - 3.0 g/l 25 - 60°C 20 - 30 min 
 
 pH: 5,5 ± 0,5 
 Buffer: The dyebaths are preferably buffered with  
     8    g/l   sodium acetate trihydrate  
  + 0,4 ml/l acetic acid for pH 5.6 
 Water quality: preferably deionized  
 Sealing: preferably with Anodal® ASL (one or two stage).  
 
 
3. Setting the Dyebath 
 
When setting the dyebath, care must be taken that the dyestuff is well dissolved. Dissolve the 
dye preferably with hot water (80°C) in a separate container (approx. 5 parts water to 1 part 
dye). Then this mother solution will be added to the dyebath while stirring. 
 
 
4. Lightfastness of the Dyeings 
 
Lightfastness of dark dyeings (12 µm):     Note  7-8  (ISO 2135). 

5. Special remarks 
 
  -  The dyestuff dyes very extensively. 
 
  -  Unsealed dyeing can be stripped with diluted nitric acid (30 %) or sulfuric acid (0.5%). 
 
  -  The dyebaths are sensitive to sulphate and aluminium; anodized objects should therefore be 
    rinsed thoroughly before dyeing.  
 
  -  Water sealing lightens the dyeing slightly. 
 
-   Prevention of mould formation : 
An addition of an antimicrobial product can inhibit mould formation for a long time.  
We recommend the addition of Nipacide CI 15 (See Technical Information) 25 – 50 mg/l. 
 
 
6. Disposal of the dyebaths 
 
Spent dyebaths can be readily precipitated with Anodal® WT-1 Liquid. The method is 
described in detail in the Technical Information bulletin for Anodal® WT-1 Liquid. 
 
The table below shows the additions required for precipitating Sanodure® Fast Bronze L. 
 
FeCl, 40 % Etching 
Anodal® WT-1 Residual dye Residual Cu 
Precipitation 
ml/g dye 3lye  Liquid  in filtrate     in filtrate 
method ml/g dye ml/g dye  mg/l mg/l 
A 5,0 - 0,3 ~ 3 ~ 0.05 
B 5,0 - 0,3 4 ~ 0.06 
C - 5,0 0,6 ~ 5 ~ 0,1 
 
 Many of their dyestuffs, pigments and chemicals are patented by Clariant in numerous industrial countries. 
® Trademark of Clariant registered in numerous countries. 
®* Trademark registered in numerous countries and licensed to Clariant. 
®+ Other Manufacturer's registered trade mark 
The signs ®, ®* and ®+ appear only at the first mention of the product. 
The information and recommendations presented here were compiled with the utmost care, but cannot be extended to cover 
every possible case. They are intended to serve as non-binding guidelines and must be adapted to the prevailing conditions.