The liquid 22 is {HEAD ~ a colored vegetable dye solution}, such as {TAIL ~ red} or blue, so as to be immediately recognizable on the cotton wadding 16 when the membrane 28 is broken 
such as
The liquid 22 is { HEAD ~ a colored vegetable dye solution } , such as { TAIL ~ red } or blue , so as to be immediately recognizable on the cotton wadding 16 when the membrane 28 is broken
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH