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litmusmore about litmus


  2  definitions  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Litmus  \Lit"mus\,  n.  [D.  lakmoes  lak  lacker  +  moes  a  thick 
  preparation  of  fruit,  pap,  prob.  akin  to  E.  meat:  cf  G. 
  lackmus.  See  {Lac}  a  resinous  substance.]  (Chem.) 
  A  dyestuff  extracted  from  certain  lichens  ({Roccella 
  tinctoria},  {Lecanora  tartarea},  etc.),  as  a  blue  amorphous 
  mass  which  consists  of  a  compound  of  the  alkaline  carbonates 
  with  certain  coloring  matters  related  to  orcin  and  orcein. 
  Note:  Litmus  is  used  as  a  dye,  and  being  turned  red  by  acids 
  and  restored  to  its  blue  color  by  alkalies,  is  a  common 
  indicator  or  test  for  acidity  and  alkalinity. 
  {Litmus  paper}  (Chem.),  unsized  paper  saturated  with  blue  or 
  red  litmus,  --  used  in  testing  for  acids  or  alkalies. 
  From  WordNet  r  1.6  [wn]: 
  n  1:  a  coloring  material  that  turns  red  in  acid  solutions  and 
  blue  in  alkaline  solutions;  used  as  an  acid-base 
  2:  absorbent  paper  full  of  litmus;  it  is  turned  red  by  acids 
  and  blue  by  alkalis  [syn:  {litmus  paper}] 

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