METHOD OF TESTING LIGHT FASTNESS AND
CHEMICAL RESISTANCE :

Light fastness :
Printed samples are exposed by Fado-O-Meter and is distinguished in five steps/grades in accordance with its dis-coloration degree and exposed period as follows :

5 : Not observed its dis-coloration within 60 hours.
4 : Observed dis-coloration within 60-41 hours.
3 : Observed dis-coloration within 40-21 hours.
2 : Observed dis-coloration within 20-11 hours.
1 : Observed dis-coloration within 10 hours.

Resistance to Heat :
Printed samples is heated by hot air at 1300C in hot air heating dry over for 10 minutes and distinguished in five steps/grading in accordance with its discoloratin degree.

Resistance to Acid :
Printed sample is dipped in 2% solution fo acid at 20- 250C for 25 hours and distinguished its strength in five steps/grading in accordance with discoloration degree and bleeded degree in solution.

Resistance to Alkali :
Printed sample is dipped in 1% solution of caustic soda at 20- 250C for 30 minutes and is distinguished its discoloration degree and bleeded degree in its solution in five steps/grades.

Praffin Resistance :
Printed sample is dipped in melted paraffin in 100- 1100C for 10 minutes and distinguished in five steps/grading by its discoloration degree and bleeded degree of colour in paraffin.

Resistance to Soap:
Printed sample is sticked to 10% soap gel 20- 250C for one hour and is distinguished its discoloration degree and bleeded degree on gel in five steps/grades.

Resistance to Alcohol:
Printed sample is dispped in Ethanol at 20- 250C for one hour and is distinguished its discoloration degree and bleeded degree of colour in solution in five steps/grades.

Press Coat Resistance :
Filter paper is dipped in solution of mixed Toluol and Acetone in the ratio of two to one is placed on the printed sample and is pressed by and iron heated at 1300C for 10 seconds. Its discoloration of sample and the transferred degree of colour on filter paper is distingushed in five steps/grades.

Steps/gradation to explain the extent of resistance, as explained are as follows :
5: Excellent; 4: Very Good; 3: Good; 2: Fair; 1: Poor

 Resistance/characteristics of Toka SG& HG Process Inks:

    RESISTANCE
sl    Ink  Heat Acid Alkali Soap Press Coat   Paraffin Alcohol Light
1  SG 210 Process Yellow 4 5 5 5 3 3 5  2
2 Process Magenta 4 3 3 1 4 4 4 4
3 Process Cyan 5 5 5 5 5 5 5 5
4 Process Black 5 5 4 4 4 5 4 5
5 HG 110 Process Yellow 4 5 5 5 3 3 5 2
6 Process Magenta 4 3 3 1 4 4 4 4
7 Process Cyan 5 5 5 5 5 5 5 5
8 Process Black 5 4 4 4 4 5 4 5



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