##### Test method

**Matter volatile at 105 ^{O}C ** Test Method (ISO787/2)

Test procedure:

1.Open the weighting bottle cover, then put the bottle into oven for heating with the temperature at 105±2℃for 2 hours and then, put it into the desiccator for cooling, weighed to the nearest 1mg.

2.Weigh 10g pigment sample and put into the bottle then covered for weigh (weighed to the nearest 1mg).

3.Remove the cover, put the bottle and sample into the oven for heating with the temperature at 105±2℃for 2 hours. Then, put it into the desiccator for cooling. Covered for weigh (weighed to the nearest 1mg). Heating again for at least 30 minutes, then cool in the desiccator, then, covered for weigh (weighed to the nearest 1mg). At last, record the lower weight.

4.Test result: using the equation: X%=(M_{0} - M_{1})/M_{0} X100

M_{0}: pigment sample weight

M_{1}: remnant weight

**Water soluble matter** Test Method (ISO787/3)

Test procedure:

1.Weigh 20g pigment sample (weighed to the nearest 0.01g), put it into beaker.

2.Add 200ml distilled water and stirred up, then boil it boiling for 5 minutes.

3.Cool the suspension to ambient temperature quickly, then move it into the measuring flask and use distilled water to dilute to 250ml then mixed completely by shaking fiercely，then, Filtrate it in the filter immediately until the liquor clear.

4.Get 100ml completely above clear liquor to evaporating basin which have been dried and weighed in advance, and then vaporized in the evaporating container.

5.Dry the evaporating basin remnant in the oven with the temperature at (105±2)℃.And then, cool the remnant and weigh (weighed to the nearest 1mg).

Repeat the method, then got the last two water soluble salts weight. Subject to the lower weight of the two.

6.Test result: using the equation: X%=M_{1}x2.5/M_{0}x100

M_{0}: pigment sample weight (Unit )

M_{1}:remnant weight

**PH value ** Test Method (ISO787/9)

Test procedure:

1.By using distilled water to get 10% the pigment suspension in the glass container. Plug the container and shake fiercely for 1 minute, and then keep static for 5 minutes, and then, move the plug, calculate the PH value, accurate to the nearest 0.1 unit. Repeat the above as another new.

2.Result: Subject to the average for the two times PH value.

**Oil Absorption** Test Method (ISO787/5)

Test procedure:

1.Weigh 10g pigment sample.

2.Put the sample in the glass panel and drop the 4# flax-core oil into the sample for the quantity no more than 10 drops per time. After dropped, must use palette knife to press for the purpose of penetrating the sample and oil with each other. Repeat the above method again and again until the sample and oil mixed fully and will never have the pigment powder and the mixed could paste the panel.

3.Record the oil consumption. Noted that the above whole process must be finished within (20-25) minutes.

4.Test result: using the equation:

1/ X%=100V/M

2/ X%=93V/M

V: consumed oil volume

M: pigment sample weight

93: 4# flax-core oil density ×100

**Full color shade** Test Method (ISO787/1)

Test procedure:

1.Weighting 1.0g sample (be accurate to 0.2 mg), put them on thelower glass panelof the muller, add 1.0ml resin and mix with palette knife. And put the pigment slurry in the middle of the glass panel. Smear the pigment upon the palette knife onto the upper glasspanelof the muller, and close the muller to grind 3 times (50 circles for each time). Collect the slurry on the both glasspanelwith the palette knife.

2. Prepare the standard samples with the same method.

3.Make a draw down with the batch along side the standard and evaluate by means of a colorcomputer

**Tinting strength and color shade on reduction** Test Method (ISO787/16)

Test procedure:

1.Weighting 1.0g Titanium Dioxide and 0.1g sample (be accurate to 0.2 mg), put them on thelower glass panelof the muller, add 1.0ml resin and mix with palette knife. And put the pigment slurry in the middle of the glass panel. Smear the pigment upon the palette knife onto the upper glasspanelof the muller, and close the muller to grind 3 times (50 circles for each time). Collect the slurry on the both glasspanelwith the palette knife.

2. Prepare the standard samples with the same method.

3.Make a draw down with the batch along side the standard and evaluate by means of a colorcomputer

**Residue on 325 mesh** Test Method (ISO787/7)

Test procedure:

1.Weigh 10g pigment sample (Weighed to the nearest 0.01g.) and put it into the 325 mesh standard sieve which have been weighed in advance.

2.Put the sieve with the pigment sampler for washing. Meanwhile, use the brush to brush the sieve and pigment until there have no pigment particles in the sieve. Then using the distilled water to wash the residue and sieve two times.

3.Dry the residue and sieve in the oven with the temperature at (105±2)℃for two hours, And then, put them into the desiccator for cooling and weigh (weighed to the nearest 1mg).

4.Test result: using the equation: X%=(M_{1} – M_{2})/MX100

M: pigment sample weight

M_{1}: residue and sieve weight

M_{2}: standard sieve weight

**Predominant particle size**

Take few pigments into a 100ml flask, and then disperse in 2 minutes by the ultrasound after adding in 5oml distilled water. At last, take few mixtures onto the TEM to observe its particle size.

**Fe _{2}O_{3 }Content **Test Method (ISO1248)

Test procedure:

Weighting 0.2g pigment (be accurate to 0.1mg), put pigment into 150ml flask, and add 30ml HClliquor on 50% strength, then dissolve the Fe_{2}O_{3 }completely by heating. Meanwhile, add in the SnCl_{2} liquoron 10% strength slowly, and the mixed solutionwill be colorless. Cool off the mixedsolutionto the room temperature, and add in 100ml distilled water and 10ml HgCl_{2} saturated liquor then shake strongly till the mixed solutionturns out to be the white sedimentation. Add in 20ml H_{2}SO_{4}-H_{3}PO_{4} mixed liquor on 30% strength and 6 dripping of C_{12}H_{10}O_{3}NSNa after that, and get to the titration with C=0.1mol/l standard solutionof K_{2}Cr_{2}O_{7. }When the solutionturns from green to purple,the test should be end and taken down the exact milliliter of theaddedK_{2}Cr_{2}O_{7.}

Test result: using the equation:Fe_{2}O_{3}%=（V·C·0.07984/M）×100

V is the exact milliliter of the K_{2}Cr_{2}O_{7}

C is the strength of the K_{2}Cr_{2}O_{7}

M is the quantity of the Iron Oxide Pigment