Filters, “black light

Fig. 8 Transmittance of black light filter as a function of wavelength (A) and as a function of the length of operation at A = 254 and 365 nm (B)...

Fig. 7 Set-up for time-resolved imaging of 96-microwell plate formats, a Fast gateable CCD-camera, b Optical emission filter, c Light-guiding adapter, consisting of 96 optical fibers, d 96-microwell plate (black with transparent bottom), e Optical excitation filter, f Pulseable LED array with 96 light emitting diodes...

Figure 12 shows results of a thermal-aging experiment. Sheets of Whatman No. 42 filter paper were first exposed to near-UV radiation (BLB fluorescent black lights), after which they were subjected to oven... 

Figure 1. Changes in postcolor number of filter-paper sheets with 15% add-on of hemicellulose fractions derived from various pulps. For comparison, the thermal discoloration of a test sheet of groundwood pulp, gp, is shown. The initial postcolor number represents the increase in color over that of the untreated filter paper a, daylight fluorescent lamps b, black-light fluorescent lamps c, heat (90 °C and 50% rh). Key O, blank filter paper , BP A, GP V, UBP 0, chlorited UBP.

The degradation pattern found for exposed doxepin solutions was quite different, depending on whether the radiation was from a mercury lamp or window-glass filtered daylight (41). Aqueous and ethanolic solutions of ketorolac tromethamine were found to decompose rapidly under a laboratory black light ( = 350nm) and degradation rate was dependent on the irradiation time (30). 

Black Light Eastern Corp., Bayside, New York, USA (UV-lamps and filters). 

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