染[rǎn]-A little explain book

染=氵(水)+九+木
"木" refer to dyestuff. most archaic dyestuff was the ancients get from the vegetation of natural world.

Most archiac dyestuffs are made from vegetation found in the natural world

Historical records, the most frequently-used dyestuffs  source is Gardenia tree's fruit and radix rubiae/Indian madder/munjeet 's flower.

From historical records, the most frequently-used dyestuffs sourced their ingredients from gardenia tree's fruit , radix rubiae,Indian madder and munjeet 's flowers.

"水" is the requisite raw material in the dyeing process, only depend it then can put the colours on the textiles uniformly.

"水" is a requisite raw material in the dyeing process since colour uniformity on textiles is dependant on it.

..................I will stop here .  I dont understand Chinese ,and made worse by the fact that I know nothing about dying to change your sentence struture or to capture your meaning )

"九" in antiquity often show/means most, here it's refer to the ancients dyeing many times, also refer to the porcess of dyeing.

"九" in antiquity

So, form the structure of "染” it's a explain book with only a character, records the ancients collect and make dyestuff, then record the way of using dyestuff to dyeing the textiles's process. So it's a story about Chinese Printing and dyeing industry long long ago...
Afterwards, the ancients also use the character "染“ when they use Chinese brush with writing ink or pigment. Because when they tinting on the white textiles, especially tinning dark colous let the textile become dark, let people feel that the textile was contaminated(污染), thus, "染” extend in meaning "contaminated(污染)" "tarnish(玷污).

染[rǎn]-A little explain book

染=氵(水)+九+木
"木" refer to dye, most archaic dye the ancients harvested from the vegetation of the natural world. According to Historical records, the most frequently-used dye source was Gardenia tree's fruit and radix rubiae/Indian madder/munjeet 's flower. "水" is the requisite raw material in the dyeing process, (only depend it then can put the colours on the textiles uniformly.)?(I don't get it) "九" in antiquity often show/means most, here it's referlong to the ancients dyeing many times, it also refers to the process of dyeing. So, from the structure of "染” it's a explanation book with only a character. records the ancients collect and make dye, they then record the way of using dyes in the textiles's process. So it's a story about Chinese Printing and the dye industry long long ago...
Afterwards, the ancients also use the character "染“ when they use the Chinese brush with writing ink or pigment, because when they use the tint on the white textiles, especially dark tints the dark colous let the textile become dark, making people feel that the textile was contaminated(污染), thus, "染” extends to mean "contaminated(污染)" or "tarnish(玷污).