US 9,810,630 B1
Fluorescent marking gel compositions and methods of use
Joseph R. Wegner, Falcon Heights, MN (US); Erin Brown, Hager City, WI (US); Xin Sun, Eagan, MN (US); and Thomas Mohs, Eagan, MN (US)
Assigned to Ecolab USA Inc., St. Paul, MN (US)
Filed by Ecolab USA Inc., St. Paul, MN (US)
Filed on Mar. 11, 2014, as Appl. No. 14/204,779.
Claims priority of provisional application 61/778,134, filed on Mar. 12, 2013.
Int. Cl. G01N 21/64 (2006.01)
CPC G01N 21/64 (2013.01) [G01N 21/6447 (2013.01); G01N 2021/6439 (2013.01); G01N 2021/6495 (2013.01); G01N 2021/6497 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for determining if a location in a space has been cleaned comprising:
a) applying a composition to a location on an environmental surface, the composition comprising:
i) a nonionic optical brightener; and
ii) a β-cyclodextrin; and
b) determining if any of the optical brightener remains on the location after the space has been cleaned.