It's usually found dried, but often kept slicker. Above another need, it's said to be thicker. What is it?

Answer: Blood

More Difficult Riddles with answers

More Difficult Riddles

Its title means book.
John's father has three sons. Two of them are Tom and Paul what is third son name? riddle answer
Just head and foot yet never tires of dancing.
Kills the bad ones and the sad ones. Tightens to fit, so one size fits.
Known to accessorize with feathers, trumpets, and harps.
Large as a mountain, small as a pea, Endlessly swimming in a water-less sea.
Lazy Larry agreed to work on a job for his brother-in-law for thirty hours at eight dollars an hour, on the condition that he would forfeit ten dollars per hour for every hour that he idled. At the end of the thirty hours Larry wasn't owed any money and didn't owe his brother-in-law any money either. How many hours did Larry work and how many hours did he idle?
Left to right I’m quite bright. Right to left I might bite.
Lily is a lilypad in a small pond. Lilly doubles her size each day, On the 20th day she covers the whole pond. On what day was Lily half the size of the pond?
Lives without a body, hears without ears, speaks without a mouth, to which the air alone gives birth. What is it?
Long and slinky like a trout, never sings till it's guts come out.
Long legs, crooked thighs, little head, and no eyes.