What is the difference between hard return and soft return? A hard return is when the user hits the return or enter key to bring subsequent text onto a new line. If you keep typing until the text reaches the end of the line and it star â¦ ts on a new line itself automatically, that is a soft return.
Definition of litmus. 1  1 : a coloring matter from lichens that turns red in acid solutions and blue in alkaline solutions and is used as an acid-base indicator. 2  2 : the critical factor in a litmus test; also : litmus test.
Litmus is a natural dye made from small plants called, lichens. These plants are of several varieties and grow in abundance in the Netherlands. When lichen called Rocella Tincotoria is allowed to react with ammonia, potassium carbonate and lime it gives a blue-color material, which is used as the coloring matter for paper.