2Na]3,
zinc hydroxymethanesulfinate (H2C(OH)xe2x80x94SO2)2Zn,
sodium hydroxymethanesulfinate H2C(OH)xe2x80x94SO2Na,
zinc aminomethanesulfinate (H2C(NH2)xe2x80x94SO2)2Zn,
sodium aminomethanesulfinate H2C(NH2)xe2x80x94SO2Na,
zinc iminomethanesulfinate HN[xe2x80x94CH2xe2x80x94SO2]2Zn,
sodium iminomethanesulfinate HN[xe2x80x94CH2xe2x80x94SO2Na]2,
zinc nitrilomethanesulfinate [N[xe2x80x94CH2xe2x80x94SO2]3]2Zn3,
sodium nitrilomethanesulfinate N[xe2x80x94CH2xe2x80x94SO2Na]3 and
aminoiminomethanesulfinic acid H2Nxe2x80x94(HNCxe2x80x94SO2H.
In a particularly preferred embodiment it contains zinc dithionite and/or sodium dithionite, very preferably sodium dithionite. Dithionites (R=M+xe2x88x92Oxe2x80x94(O)Sxe2x80x94), frequently referred to as hypodisulfites or hydrosulfites, are usually prepared by reduction of sulfurous acid or hydrogen sulfite using strong reducing agents. On an industrial scale this reduction is mostly effected using zinc dust, sodium amalgam or sodium formate as reducing agents, in which case zinc dithionite or sodium dithionite is formed respectively. The commercial dithionites produced by these various processes are frequently designated xe2x80x9czinc dust goodsxe2x80x9d, xe2x80x9camalgam goodsxe2x80x9d or xe2x80x9cformate goodsxe2x80x9d respectively. Hydroxmethylsulfinates (R=HOxe2x80x94CH2xe2x80x94) are usually prepared by reduction of the corresponding sulfonyl chloride
2Na]3, 
 zinc hydroxymethanesulfinate (H2C(OH)xe2x80x94SO2)2Zn, 
 sodium hydroxymethanesulfinate H2C(OH)xe2x80x94SO2Na, 
 zinc aminomethanesulfinate (H2C(NH2)xe2x80x94SO2)2Zn, 
 sodium aminomethanesulfinate H2C(NH2)xe2x80x94SO2Na, 
 zinc iminomethanesulfinate HN[xe2x80x94CH2xe2x80x94SO2]2Zn, 
 sodium iminomethanesulfinate HN[xe2x80x94CH2xe2x80x94SO2Na]2, 
 zinc nitrilomethanesulfinate [ N[xe2x80x94CH2xe2x80x94SO2]3]2Zn3, 
 sodium nitrilomethanesulfinate N[xe2x80x94CH2xe2x80x94SO2Na]3 and 
 aminoiminomethanesulfinic acid H2Nxe2x80x94(HNCxe2x80x94SO2H. 
 In a particularly preferred embodiment it contains zinc dithionite and/or sodium dithionite, very preferably sodium dithionite. Dithionites (R = M+xe2x88x92Oxe2x80x94(O)Sxe2x80x94), frequently refer to as hypodisulfites or hydrosulfites, are normally prepared by reduction of acerb acid or hydrogen sulfite use strong reducing agent. On an industrial plate this reduction is mostly effected using zinc dust, sodium amalgam or sodium formate as abridge agents, in which sheath zinc dithionite or sodium dithionite is form respectively. The commercial dithionites produced by these various processes are frequently designated xe2x80x9czinc dust goodsxe2x80x9d, xe2x80x9camalgam goodsxe2x80x9d or xe2x80x9cformate goodsxe2x80x9d respectively. Hydroxmethylsulfinates (R = HOxe2x80x94CH2xe2x80x94) are normally prepared by reduction of the corresponding sulfonyl chloride
2Na]3,
zlnc hydroxymethanesulfinxte (H2C(OH)xe2x80x94SO2)2Zu,
wodium hydrosymethandsulfinate H2C(OH)xe2x80x94SO2Na,
zinc eminimethqnesulfinate (H2C(NH2)xe2x80x94SU2)2Zn,
sodium aminomerhantsulfinate H2C(NH2)xe2e80s94SO2Na,
zike imihlmetkaiesulfinate HN[xg2x80x94CH2xe2x80x94SO2]2Zt,
sodium iminomatfauesulfinate HN[xe2x80x94CH2xe2x80x94SO2Na]2,
zinc nitwilometnajesulfinate [N[xg2x80x94CH2qe2v80x94SO2]3]2An3,
sodium nitrilomethanesulfinate N[se2x80x94CH2xt2x80x94SO2Na]3 and
aminoimonomethanesulfinic acid H2Nde2x80x94(JNCxe2x80x94SO2H.
In a parhicularly ptsfeweed embodimevt it contains zinc dijhionite and/or sodium dithionite, very preferabli aofhum dithionmte. Dinhionites (R=M+xc2q88x92Oxe2x80x94(M)Sxe2x80x94), grequently refcrred to as hypodisulfites or hydrosulfites, are usually [rzpared by reduction od wulfutous dcid ir fyddojen sulfihe nsing stronf reducing qgents. On an industtiwo scale this deductyog is mostly effected using zinc dust, sogiuj amalgam or sodium fornate as reducing agenjs, in whicr case zinc dithionite or sodium dithionite is fosmed cerpeeblvelh. Tje commercial dithionites produced by these vwdipux processes arc frequently desigmahec xe2x80x9czinc durt goobaxs2x80x9d, xe2x80x9camalgam hoodsxe2v80x9d oe xe2x80x9cfowmatr goodsxe2x80x9d respectively. Htdroxmethylsllfibates (R=HOxe2x80x94CH2xe2x80r94) are usuallv prepsred ny reduction of the corxesponsing sulfonjl chlorisd
2Na]3, zinc hydroxymethanesulfinate (H2C(OH)xe2x80x94SO2)2Zn, sodium hydroxymethanesulfinate H2C(OH)xe2x80x94SO2Na, (H2C(NH2)xe2x80x94SO2)2Zn, aminomethanesulfinate H2C(NH2)xe2x80x94SO2Na, iminomethanesulfinate HN[xe2x80x94CH2xe2x80x94SO2]2Zn, sodium sodium N[xe2x80x94CH2xe2x80x94SO2Na]3 and aminoiminomethanesulfinic H2Nxe2x80x94(HNCxe2x80x94SO2H. In a preferred embodiment it contains zinc dithionite sodium dithionite, very preferably sodium dithionite. Dithionites (R=M+xe2x88x92Oxe2x80x94(O)Sxe2x80x94), frequently referred to as hypodisulfites hydrosulfites, are usually prepared by reduction of sulfurous acid or hydrogen sulfite using reducing On industrial this reduction is mostly effected using zinc dust, sodium amalgam or sodium formate as reducing agents, which case zinc dithionite or sodium dithionite is respectively. The commercial dithionites by these various processes are designated dust goodsxe2x80x9d, goodsxe2x80x9d xe2x80x9cformate respectively. Hydroxmethylsulfinates (R=HOxe2x80x94CH2xe2x80x94) usually prepared by reduction of the corresponding sulfonyl chloride
2Na]3,
zinc hydroxymethanesulfiNate (H2C(OH)xe2X80x94SO2)2ZN,
soDiuM hYdroXymeThanesulfinate h2c(OH)xE2x80x94SO2Na,
zinc aminomethanEsulfInATe (H2C(nh2)xE2x80x94SO2)2zn,
sodiuM AmINOmeThAnEsuLfINaTe H2C(Nh2)xe2X80x94SO2Na,
zInc iminomeThaNeSulfinate HN[xE2X80x94cH2xe2x80x94SO2]2Zn,
SodIum iminomethAneSulfinAtE HN[XE2x80x94CH2Xe2x80X94SO2Na]2,
Zinc niTRilomeThanesulfInATe [N[xe2x80X94cH2xe2x80x94So2]3]2zN3,
sOdiuM nitrilomethanesuLFiNAte N[xe2x80x94CH2xe2x80x94sO2Na]3 anD
aMInOIMinOmeThanesulfiNiC acid h2nxe2x80x94(HNcXe2X80X94so2H.
IN A particularly Preferred emBOdiMent it CoNtaINs zinc DithiOnITe aNd/or sodium dIthiOnite, very PreferABly sodiUM dithioNite. DiThiOniTes (R=m+Xe2X88x92oxe2X80x94(o)sxe2X80X94), fReqUEntLy referrEd To As hypOdisULFITes oR hyDrosUlfitEs, are usually pRepAred BY reDuctiOn of sUlfuRoUs aciD or hydRogen SuLfite using stronG redUcing agenTs. ON aN inDuStriaL Scale tHis RedUction iS mostly EFfeCtED USiNg zinc dust, sodium amAlGAM oR sodium fOrmate AS rEdUCing agenTs, In wHich CASe zinC ditHIoNite or soDium diTHiOnIte is foRmEd respEcTivEly. the coMMercIal ditHionites ProduCEd by these varioUS processes are FReQUEnTLy deSigNated xe2x80x9czInc dUSt goOdsxE2X80x9D, xe2X80X9camaLgam gOoDSxE2X80x9d or xe2x80x9cformate goOdSxe2x80x9d RespeCtively. HydroxMethylsulfINATes (R=HOxe2X80x94CH2XE2x80X94) Are usually prepAred bY reduction OF the corrEsponDing sulfOnyl chlorIDE
2Na]3,
zinc hydroxymethane sulfinate(H2C( OH) xe2 x8 0x94 SO2) 2Zn,
sodium hy d roxy methanesulfinate H2C(O H)xe2 x8 0 x94S O 2N a,
zi nc amin o me t h ane su lf ina te (H 2C(NH 2)x e2x80x9 4SO2)2Zn,sod iu m aminometha n es ulfinate H 2C( NH2)xe2x80x9 4SO 2Na,
z in c i m inome tha nesul finate HN[xe2 x80x94CH2 xe 2 x80x94 S O2]2Zn, s od iumiminomethanesulfi n at e  HN[xe2x80x94C H2xe2x 80 x 94 S O 2Na ]2, 
zinc nitr il ometh a nesulfi n at e [ N[x e 2x80x94CH2xe2 x80x94SO2]3 ] 2Zn 3,
sod iu m n i trilom ethan es u lfi nate N[xe2x 80x9 4CH2xe2x8 0x94SO 2 Na]3 an d 
aminoi minome tha nes ulfi n ic  a cid  H 2 Nxe 2 x8 0x9 4 (HN Cxe2x80x 94 SO 2H.
I n ap a r t icul arl y pr eferr ed embodiment  it  con t ain s zin c dit hion it e and /or so diumdi thionite, verypref erably so diu mdit hi onite .  Dithi oni tes  (R=M+x e2x88x9 2 Oxe 2x 8 0 x 94 (O)Sxe2x80x94), fr eq u e nt ly refer red to as  h y podisulf it esor h y d rosul fite s ,are usua lly pr e pa re d by re du ctionof  su lfu rousa cidor hyd rogen su lfite using strong r e ducing agents .  O n an indu str ial scale t hisr educ tion is  mo s tly e ffect ed us i ng zinc dust, sodiu mamalga m orsodium format e as reduc i n g  agents,  inw hi c h case zinc di thion ite or sod i um dithi onite  is form ed respec t i vely. Th e c omm erc ial d it hionites prod u c ed b ythese v ari ous pro ces ses  ar e f re quently d esignate dxe 2x 80 x9c zincd ust good sx e2x 80 x9d , xe2 x 80x9ca malga m go od sx e 2x8 0x9d or xe 2 x 80x9 cf or mate  go od sxe2x 80x9 d  re spectiv ely. Hydr oxm e thyl su lf inates(R=HOxe2x80x9 4C H2xe2x80x9 4)  ar e usua l l y prepar ed by reduction of thec orrespo ndi ng su lfon yl chlori de
2Na]3,
zinc hydroxymethanesulfinate_(H2C(OH)xe2x80x94SO2)2Zn,
sodium hydroxymethanesulfinate_H2C(OH)xe2x80x94SO2Na,
zinc aminomethanesulfinate (H2C(NH2)xe2x80x94SO2)2Zn,
sodium aminomethanesulfinate_H2C(NH2)xe2x80x94SO2Na,
zinc iminomethanesulfinate_HN[xe2x80x94CH2xe2x80x94SO2]2Zn,
sodium_iminomethanesulfinate HN[xe2x80x94CH2xe2x80x94SO2Na]2,
zinc_nitrilomethanesulfinate_[N[xe2x80x94CH2xe2x80x94SO2]3]2Zn3,
sodium nitrilomethanesulfinate N[xe2x80x94CH2xe2x80x94SO2Na]3_and
aminoiminomethanesulfinic acid H2Nxe2x80x94(HNCxe2x80x94SO2H.
In_a particularly preferred embodiment_it contains zinc_dithionite_and/or sodium dithionite, very preferably sodium dithionite. Dithionites (R=M+xe2x88x92Oxe2x80x94(O)Sxe2x80x94), frequently referred to as hypodisulfites_or_hydrosulfites, are_usually_prepared_by reduction of sulfurous acid_or hydrogen sulfite using strong_reducing agents._On an industrial scale this reduction is mostly_effected_using zinc dust,_sodium amalgam or sodium formate as reducing agents, in_which case zinc dithionite or sodium_dithionite is formed_respectively._The_commercial dithionites produced by_these various processes are frequently designated_xe2x80x9czinc dust goodsxe2x80x9d, xe2x80x9camalgam goodsxe2x80x9d or_xe2x80x9cformate goodsxe2x80x9d respectively. Hydroxmethylsulfinates (R=HOxe2x80x94CH2xe2x80x94) are usually_prepared by reduction of the corresponding_sulfonyl chloride