TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The composition (C1) comprises (wt.%): HFC-1234yf (0.1-99), HFC-125 (0.1-99), and at least one compounds selected from n-butane, isobutene and/or HFC-143a; HFC-1234yf (0.1-98), HFC-125 (0.1-98), and n-butane (0.1-98); HFC-1234yf (1-40), HFC-125 (59-98), and isobutene (1-20); or HFC-1234yf (1-60), HFC-125 (1-98), and HFC-143a (1-98). The composition (C1) further comprises a lubricant, a tracer, a compatibilizer, at least one ultra-violet fluorescent dye, at least one solubilizing agent (s1), an odor masking agent, and a stabilizer. The composition (C2) is an azeotropic composition comprising (wt.%): HFC-1234yf (14.4), HFC-125 (89.1), and isobutene (1.2) at a pressure of 40.81 psi (281 kPa) and a temperature of -25 degrees C.; or HFC-1234yf (9.7), HFC-125 (43.5), and HFC-143a (42.1) at a pressure of 38.62 psi (266 kPa) and a temperature of -25 degrees C. Preferred Components: The lubricant is selected from mineral oil, alkylbenzenes, synthetic paraffins or synthetic napthenes. The tracer is selected from hydrofluorocarbons, deuterated hydrocarbons, deuterated hydrofluorocarbons, perfluorocarbons, fluoroethers, brominated compounds, iodated compounds, alcohols, aldehydes, ketones and/or nitrous oxide (N2O), (preferably CD3CD3, CD3CD2CD3, CD2F2, CF3CD2CF3, CD2FCF3, CD3CF3, CDF2CF3, CF3CDFCF3, CF3CF2CDF2, CDF2CDF2, CF3CF2CD3, CF3CD2CH3, CF2CH2CD3, CF3CF3, cyclo-CF2CF2CF2-, CF3CF2CF3, cyclo-CF2CF2CF2CF2-, CF3CF2CF2CF3, CF3CF(CF3)2, cyclo-CF(CF3)CF2CF(CF3)CF2-, CF3OCHFCF3, CF3OCH2CF3, CF3OCH2CHF2, CF3CH2OCHF2 CH3OCF2CF3, CH3CF2OCF3CF3CF2CF2OCHFCF3, CF3CF2CF2OCF(CF3)CF2OCHFCF3, CHF3, CH2FCH3, CHF2CH3, CHF2CHF2, CF3CHFCF3, CF3CF2CHF2, CF3CF2CH2F, CHF2CHFCF3, CF3CH2CF3, CF3CF2CH3, CF3CH2CHF2, CHF2CF2CH3, CF3CHFCH3, CF3CH2CH3, CH3CF2CH3, CH3CHFCH3, CH2FCH2CH3, CHF2CF2CF2CF3, (CF3)2CHCF3, CF3CH2CF2CF3, CHF2CF2CF2CHF2, CH3CF2CF2CF3, CF3CHFCHFCF2CF3, perfluoromethylcyclopentane, perfluoromethylcyclohexane, perfluorodimethylcyclohexane (ortho, meta, or para), perfluoroethylcyclohexane, perfluoroindan, perfluorotrimethylcyclohexane and its isomers, perfluoroisopropylcyclohexane, cis-perfluorodecalin, trans-perfluorodecalin, cis- or trans-perfluoromethyldecalin and its isomers, CH3Br, CH2FBr, CHF2Br, CHFBr2, CHBr3, CH2BrCH3, CHBr?=CH2, CH2BrCH2Br, CFBr=CHF, CF3I, CHF2I, CH2F1, CF2CH2F, CF21CHF2, CF21CF2I, C6F5, ethanol, n-propanol, isopropanol, acetone, n-propanal, n-butanal, methyl ethyl ketone, and/or nitrous oxide). The ultra-violet fluorescent dye is selected from naphthalimides, perylenes, coumarins, anthracenes, phenanthracenes, xanthenes, thioxanthenes, naphthoxanthenes, fluoresceins, and/or their derivatives. The solubilizing agent is selected from hydrocarbons, dimethylether, polyoxyalkylene glycol ethers, amides, ketones, nitriles, chlorocarbons, esters, lactones, aryl ethers, fluoroethers, and 1,1,1-trifluoroalkanes (preferably solubilizing agent (s1)). The stabilizer is selected from nitromethane, hindered phenols, hydroxylamines, thiols, phosphates or lactones. The high GWP refrigerant (A1) is selected from R134a (1,1,1,2-tetrafluoroethane), R22 (chlorodifluoromethane), R123 (2,2-dichloro-1,1,1-trifluoroethane), R11 (fluorotrichloromethane), R245fa (1,1,1,3,3-pentafluoropropane), R114 (1,2-dichloro-1,1,2,2-tetrafluoroethane), R236fa (1,1,1,3,3,3-hexafluoropropane), R124 (2-chloro-1,1,1,2-tetrafluoroethane), R12 (dichlorodifluoromethane), R407C (ASHRAE designation for a blend of 52 wt.% R134a, 25 wt.% R125 (pentafluoroethane), and 23 wt.% R32 (difluoromethane)), R410A (ASHRAE designation for a blend of 50 wt.% R125 and 50 wt.% R32), R417A, (ASHRAE designation for a blend of 46.6 wt.% R125, 50 wt.% R134a, and 3.4 wt.% n-butane), R404A, (ASHRAE designation for a blend of 44 wt.% R125, 52 wt.% R143a (1,1,1-trifluoroethane), and 4 wt.% R134a), R502 (ASHRAE designation for a blend of 51.2 wt.% CFC-115 (chloropentafluoroethane) and 48.8 wt.% R22), R507A (ASHRAE designation for a blend of 50 wt.% R125 and 50 wt.% R143a), or R422D, (ASHRAE designation for a blend of 85.1 wt.% R125, 11.5 wt.% R134a, and 3.4 wt.% isobutane). The compatibilizer and solubilizing agent (s1) are selected from amides of formulae R1aC(O)NR2aR3a and cyclo-(R4aCON(R5a)), where the amides have a molecular weight of 100-300 atomic mass units; ketones of formula R1bC(O)R2b, where the ketones have a molecular weight of 70-300 atomic mass units; nitriles of formula R1cCN, where the nitriles have a molecular weight of 90-200 atomic mass units; chlorocarbons of formula RClx', where the chlorocarbons have a molecular weight of 100- 200 atomic mass units; aryl ethers of formula R1dOR2d, where the aryl ethers have a molecular weight of 100-150 atomic mass units; 1,1,1-trifluoroalkanes of formula CF3R1e; fluoroethers of formula R1fOCF2CF2H, derived from fluoroolefins and polyols, where the fluoroolefins are of the type CF2=CX'Y', and the polyols are linear or branched, selected from HOCH2(CHOH)x1(CR'1R'2)y1CH2OH, HOCH2CR'1R'2(CH2)z(CHOH)x1CH2(CH2OH)y1, or C(OH)t(R'1)u(CH2OH)v((CH2)mCH2OH)w; lactones of formulae (I)-(III) having molecular weight of 100-300 atomic mass units; or esters of formula R1iCO2R2i, where the esters have a molecular weight of 80-550 atomic mass units.R1a-R3a and R5a=1-12C aliphatic hydrocarbon, 1-12C alicyclic hydrocarbon, or 6-12C aromatic radical;R4a=3-12C aliphatic hydrocarbylene;R1b and R2b=1-12C aliphatic hydrocarbon, 1-12C alicyclic hydrocarbon and 1-12C aryl hydrocarbon;R1c=5-12C aliphatic hydrocarbon, 5-12C alicyclic hydrocarbon or 5-12C aryl hydrocarbon radical;x'=1 or 2;R=1-12C aliphatic hydrocarbon or 1-12C alicyclic hydrocarbon;R1d=6-12C aryl hydrocarbon;R2d=1-4C aliphatic hydrocarbon;R1e=5-15C aliphatic hydrocarbon or 5-15C alicyclic hydrocarbon;R1f=5-15C aliphatic hydrocarbon, 5-15C alicyclic hydrocarbon, or 5-15C aromatic hydrocarbon;X'=H, chloro or fluoro;Y'=chloro, fluoro, CF3 or OR1g;R1g=CF3, C2F5 or C3F7;R'1 and R'2=H, CH3 or C2H5;x1, v and w=0-4;y1, m=0-3;t, u and z=0 or 1;ort+u+v+w=4;R1h-R8h=H, linear, branched, (bi)cyclic, (un)saturated hydrocarbyl radicals;R1i and R2i=linear, cyclic and (un)saturated, alkyl and aryl.Provided that:(1) at least one of R1 and R3 is selected from the hydrocarbon radicals; or(2) at most one of R1a-R3a and R5a is 6-12C aromatic radical.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The lubricant is selected from polyol esters, polyalkylene glycols, polyvinyl ethers, or poly(alpha)olefins. The compatibilizer and solubilizing agent (s1) are selected from polyoxyalkylene glycol ethers of formula R1((OR2)xOR3)y, where the glycol ethers have a molecular weight of 100-300 atomic mass units.x=1-3;y=1-4;R1=H, 1-6C aliphatic hydrocarbon radicals or y bonding sites;R2=2-4C aliphatic hydrocarbylene;R3=H, or 1-6C aliphatic hydrocarbon, 1-6C alicyclic hydrocarbon. EXAMPLE - No suitable example given.