Regular dye.
To get ivory silk flowers to turn white, you will have to dye them. You can do this buy purchasing white dye. Mix the dye in a bucket, wearing gloves, tip each flower head into the dye for the recommended period of time suggested on the box.
Silk, thread, dye
Gardenias are widely used as exotic ornamental flowers in corsages, as houseplants and as outdoor plants. A yellow silk dye has been made for centuries from the gardenia berry.
You can't dye silk in Runescape because Jagex hasn't made a feature to do so.
Pink Dye
Nope. Silk is white. If you dye into green, it will turn in to green.
Orange dye can be made by putting yellow dye (from crafting yellow flowers) and red dye (from crafting red flowers) on the crafting table.
Never ever use bleach on silk!
Silk is such a perfect fibre as it is, the only improvement you can make may be to dye it a different colour.
Wild silk is Harder to dye and differs in texture and color making it less uniform cultivated silk is more popular.
The dye binds to the protein in an egg shell; this is an animal protein, similar to silk or wool. The same types of dyes that work on silk or wool will also dye eggs. The dye molecules bind, both directly and via hydrogen bonds, to protein molecules in the eggshell. The dyes used to dye eggs are acid dyes, called that because they work best in an acid environment. Vinegar is an acid, and adding it to the dye solution makes it more acid, and potentiates both types of binding.
It's possible that you would dye the flower but that flower probably won't live very long if you just toss a bunch of flowers in some dye.