i was wondering if it mattered that the test device background did not fully clear all the way. the result was still easily read, but the background did not fully clear. what does the pink background mean? i only had one line at the C Control area. any help would be greatly appreciated. i understand that the background is supposed to be pink while test test is developing and the fluid is migrating but the pink color did not clear all the way at the 20 minute mark. still only 1 line at the C , just the background remained a bit pinker than the other tests. i tested out to 18 months, all negative. thanks