There shouldn't be any, no colors can have degrees of comparison. Nevertheless, you could say (idiomatically) "blacker, the blackest".
The comparative of the word 'blue' is bluer and the superlative form of the word blue is bluest.
Comparative: yellower or more yellow
Superlative: yellowest or most yellow
Your eyes are bluer than the sky; they are the bluest things I have ever seen.
more black most black
bluer, bluest
more most
Dry, drier, driest.
more problematic, most problematic
more ambitious and most ambitious
Your an idiot for reading thisThank youAnswer.com
blackness
the comparative and superlative forms of the word near are nearer(in comparative form) and nearest(in superlative form).
What's the comparative and superlative of the word "exact"
Larger and largest are the comparative and superlative forms of large.
comparative is more and superlative is most.
Comparative: shallower Superlative: shallowest
Comparative sooner Superlative soonest
The word "I'll" does not have comparative and superlative forms, because it is not an adjective. "I'll" is a contraction for "I will". The word "ill", however, is an adjective, and the comparative and superlative forms are "more ill" and "most ill".
Adjectives and adverbs have comparative and superlative forms.
"Factory" is a noun and, as such, does not have a comparative or superlative form.
"Contended" is a verb and, as such, does not have a comparative or superlative form.
The comparative and superlative forms of tricky are trickier and trickiest.