Claims
- 1. An indicator for detecting defects during non-destructive testing of a surface for imperfections comprising:
- a gas permeable base material, such as a chromatographic and/or electrophoretic paper, that is impregnated with a sulfonephthalein indicator in the concentration of 0.0001-0.001 grams per cubic centimeter and chlorhydric acid in the concentration range of 0.00001-0.00002 grams per cubic centimeter.
- 2. The indicator material according to the claim 1, wherein said indicator is tetrabrom-m-cresolsulfonephthalein.
- 3. The indicator material according to the claim 1, wherein said indicator is dibrom-o-cresolsulfonephthalein.
- 4. The indicator material according to the claim 1, wherein said indicator is tetrabromophenolsulfonephthalein.
- 5. An indicator for detecting defects during non-destructive testing of a surface for imperfections comprising:
- a gas permeable base material, such as a chromatographic and/or electrophoretic paper, that is impregnated with a o-cresolsulfonephthalein in the concentration of 0.0001-0.001 grams per cubic centimeter and chlorhydric acid in the concentration range of 0.0001-0.001 grams per cubic centimeter.
Priority Claims (1)
Number |
Date |
Country |
Kind |
94021094 |
Jun 1994 |
RUX |
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RELATED APPLICATIONS
This is a divisional application of Ser. No. 08/329,203 filed Oct. 26, 1994.
US Referenced Citations (5)
Foreign Referenced Citations (4)
Number |
Date |
Country |
667845 |
Jun 1979 |
RUX |
832411 |
May 1981 |
RUX |
1610349 |
Nov 1990 |
RUX |
1661632 |
Jul 1991 |
RUX |
Divisions (1)
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Number |
Date |
Country |
Parent |
329203 |
Oct 1994 |
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