CHUO Black Color's
Spirit Black（C.I.Solvent Black 7）
Name Outlook Moisture[%] Ash[%] pH Color Tone
MB Black Powder below 3.5 below 3.0 4.0〜6.0 4〜5
CA below 3.0 below 3.0 4.5〜6.5 4〜5
Nigrosine Base（C.I.Solvent Black 7）
Name C.I.Name Fastness
Acid resistance Heat resistance Weather resistance Alkali resistance
Black S Sol. Black 7 Class 5 A A A
Black SF Sol. Black 7 Class 5 A A A
Black 109 Sol. Black 7 Class 5 A A A

* All the products as above are registered as existing chemical substances.
* Evaluation of fastness indicates phases as follows;
  A: no changed B: Faintly changed C: Slightly changed  
 
Weather resistance： Evaluation by Gray scale
Heat resistance： Electric desiccators 180、150、120℃ 10分
Resistance to acids： 1% sulfuric acid solution immersed for 24 hrs.
Resistance to alkalis： 1% caustic soda solution immersed for 24 hrs.
solubility Methanol N-Butanol Benzol Xylene Toluene Ethyl acetate
Black S 0.7 1.1 [15] [20] [20] 0.7
Black SF 0.7 1.1 [15] [20] [20] 0.7
Black 109 5.0 8.2 9.2 8.8 9.1 3.6

Test method of solubility is as follows;
Dissolve 5g of sample in 50cc solvent and allow to stand for 12 hours then filtrate this solution and distill in oven.
Measure solubility in balance distilled solution by weight percent.

The solubility of [  ] is measured by the method as follows;
Dissolve 10g of sample in 45cc + oleic acid 5g and allow to stand for 12 hours then filtrate this solution and distill in oven.
Measure solubility in balance distilled solution by weight percent.

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