Process for fluorescence detection of extremely small flaws

Claim 1

IN AN INSPECTION PROCESS IN WHICH THIN FILMS OF A FLUORESCENT TRACER ARE REVEALED BY A FLUORESCENCE RESPONSE, THE STEP OF PREPARING A FLUORESCENT TRACER BY DISSOLVING AT LEAST ONE SENSITIZER IN A SOLVENT CARRIER, SAID FLUORESCENT TRACER CONSISTING ESSENTIALLY OF AT LEAST ONE SENSITIZER SELECTED FROM THE GROUP CONSISTING OF FLUORESCENT (DI)AMINOSTILBENE(DI)SULFONIC ACID DYES, FLUORESCENT DIBENZOTHIOPHENE DYES, FLUORESCENT MONOAZOLE DYES, FLUORESCENT BISAZOLE DYES, FLUORESCENT COUMARIN DYES, FLUORESCENT PERYLENE DYES, FLUORESCENT NAPHTHALIC ACID IMIDE DYES, FLUORESCENT PYRIDOTRIAZOLE DYES, FLUORESCENT DI-HYDROCOLLIDINE DYES, PYRENE, 1''-HYDROXY-2''-ACETONAPHTHONE, FLUORESCENT ACRIDINE DYES HAVING COLOR INDEX DESIGNATIONS OF 46000, 46025, 46050, 46055, 46060, 46065, 46080, BASIC ORANGE 14, 15, 16, AND 23, AND BASIC YELLOW 6 AND 9, FLUORESCENT XANTHENE DYES HAVING COLOR INDEX DESIGNATIONS OF 45000, 45005, 45006, 45010, 45015, 45020, 45050, 45090, 45100, 45105, 45155, 45165, 45210, BASIC RED 8, AND BASIC VIOLET 11, FLUORESCENT BRIGHTENING AGENTS HAVING COLOR INDEX DESIGNATIONS OF C. I. BRIGHTENING AGENT 2, 3, 4, 5, 6, 8, 9, 22, 24, 25, 26, 29, 30, 46, 47, 53, 54, 55, 56, 57, 59, 60, 61, 65, 66, 67, 68, 69, 70, 71, 74, 75, 76, 77, 78, AND FLUORESCENT DYES HAVING COLOR INDEX DESIGNATIONS OF BASIC ORANGE 10, ACID YELLOW 7, BASIC YELLOW 7, DISPERSE YELLOW 11, 13, AND 31, DIRECT YELLOW 59, SOLVENT YELLOW 44, SOLVENT GREEN 5, ACID RED 50, 52, AND 87, BASIC RED 1, BASIC VIOLET 10, ACID VIOLET 7, DEVELOPER 8, AND SOLVENT RED 36 AND 45, RESPECTIVELY, AND A LIQUID SOLVENT CARRIER FOR SAID SENSITIZER, SAID SENSITIZER BEING SELECTIVELY USED SINGLY AND IN COMBINATION AND BEING PRESENT IN SAID LIQUID SOLVENT CARRIER WITHIN THE RANGE OF PROPORTIONAL CONCENTRATIONS FROM AT LEAST ABOUT 15 GRAMS PER PINT UP TO THE LIMIT OF SOLUBILITY OF SAID SENSITIZER, WHEREBY THE DIMENSIONAL THRESHOLD OF FLUORESCENCE IS ADJUSTED TO AN OPERATIONAL VALUE BELOW ABOUT 250 MILLIMICRONS.