The r_und_s package decodes the german ‘R- und S-Sätze’, which are numerically coded security advice for chemical substances into plain text. This is, e.g., used to compose security sheets or lab protocols and especially useful for students of chemistry.

There are four packages, giving texts in German, English, French and Dutch.

The author is Thiemo Nordenholz. The package is Copyright © 1997-2005 Thiemo Nordenholz.