Pollutant test patches

Can anyone advise me on choices of  pollutant reactive patches which
can be used in display cases or in testing applications to detect
airborne chemicals which might damage museum collection items.

Kate Roberts

                                  ***
                  Conservation DistList Instance 9:60
                   Distributed: Monday, March 4, 1996
                        Message Id: cdl-9-60-022
                                  ***