Method of oil testing and composition therefor

Claim 1

AN ACID-BASE INDICATOR COMPOSITION WHICH COMPRISES FROM ABOUT 0.001 TO ABOUT 0.002 MOLE OF BROMOCRESOL GREEN AND FROM ABOUT 0.0002 TO ABOUT 0.04 MOLE OF 4AMINO-1-NAPHTHALENEAZOBENZENE-4''-SULFONIC ACID PER LITER OF A DEVELOPER SOLUTION CONSISTING ESSENTIALLY OF FROM ABOUT 20% TO ABOUT 40% BY VOLUME OF AQUEOUS ETHANOL CONTAINING FROM 0.5 TO 20% BY VOLUME WATER BASED ON SAID AQUEOUS ETHANOL, FROM ABOUT 10% TO ABOUT 30% BY VOLUME 4-METHYL-2-PENTANOL, FROM ABOUT 0.1 TO 1.5% BY VOLUME GLYCEROL, FROM ABOUT 4% TO ABOUT 70% BY VOLUME ALPHA-METHYLNAPHTALENE AND FROM ABOUT 4 TO ABOUT 50 PERCENT BY VOLUME OF A HOMOGENEOUS SOLVENT MIXTURE WHICH BOILS WITHIN THE RANGE OF ABOUT 100* TO ABOUT 100* F., AND THE AROMATIC CONTENT OF WHICH IS FROM ABOUT 30% TO ABOUT 70% BY WEIGHT OF SAID SOLVENT MIXTURE.

Claim 2

THE METHOD FOR DETERMINING THE SUITABILITY OF A USED LUBRICATING OIL FOR FURTHER USE IN AN INTERNAL COMBUSTION ENGINE WHICH COMPRISES PLACING A SMALL QUANTITY OF SAID OIL IN A THIN ESSENTIALLY WHITE POROUS MEDIUM, POURING OVER SAID SMALL QUANTITY OF OIL A SOLUTION OF AN ORGANIC ACID-BASE INDICATOR COMPOUND WHICH EXHIBITS A COLOR CHANGE IN THE PH RANGE OF 3 TO 6 IN AN ESSENTIALLY NEUTRAL DEVELOPER SOLUTION COMPRISING ESSENTIALLY FROM ABOUT 0.5 TO ABOUT 20% BY VOLUME OF WATER, AT LEAST 15% BY VOLUME OF A MONOHYDRIC ALCOHOL AND FROM ABOUT 4 TO ABOUT 70% OF A WATER IMMISCIBLE OIL-SOLVENT, THE CONCENTRATION OF SAID ACID-BASE INDICATOR COMPOUND IN SAID DEVELOPER SOLUTION BEING FROM ABOUT 0.0001 TO ABOUT 0.05 GRAM MOLES OF SAID INDICATOR COMPOUND PER LITER OF SAID DEVELOPER SOLUTION.