Rainbow bouquets: what the gesture says before anyone reads the card
Every bouquet carries a message the recipient decodes in a second, usually without thinking about it. This one says the sender wanted a reaction. That is a perfectly good message on a birthday and a poor one at a funeral, a formal dinner or a first apology, so occasion decides this order more than flowers do.
Children read it best of all.
Where it lands well
Birthdays, especially for anyone under about fifteen, where the point is the object rather than the sentiment. School and university milestones, where a group photograph is guaranteed and a pale bouquet would vanish in it. A colleague leaving for something better, where the tone should be warm and openly unserious.
It also earns its keep in front of a camera. Party photographs, shop openings and stage handovers all need one object that holds the frame, and multi-coloured flowers do that at a distance where a cream bouquet reads as a beige smudge.
The last case is a recipient who already receives flowers regularly. Another dozen roses is a repeat; this is not, and the difference is the whole reason people order it.
Where it misfires
Condolence and remembrance are the clear no. Formal business gifts are the second, since anything obviously treated reads as a novelty and undercuts the occasion.
Romance is the awkward middle. A rainbow bouquet can work between two people who share that kind of humour, and it lands badly with anyone expecting a serious gesture, which is not something worth guessing about.
The colour is added, and here is how
A rainbow rose starts as a white one. Its stem is split lengthwise into several channels below the head, each channel is stood in water tinted a different colour, and a flower draws that tinted water up as it would plain water. Dye travels to petal veins and settles along them, so each channel feeds its own sector of a bud and stripes follow that veining rather than a brush stroke.
You can tell this method from spray painting by looking at the back of a petal and at the leaves. Dye taken up through the stem leaves the petal reverse paler and the foliage untouched; aerosol colour lies in an even film and reaches both.
Neither method is a secret ingredient and neither makes the flower last longer. A split stem is mechanically weaker than a whole one, the dyeing itself uses up part of the flower's vase life, and the honest expectation is a shorter life than a plain white rose of the same batch.
Buying and keeping
Ask which method was used before ordering, since the two look different at close range and only one of them can transfer colour onto damp hands.
Care is ordinary. Clean water, changed regularly, a fresh cut above the split, and a cool spot away from a fruit bowl. Vase water may tint slightly on day one as residual dye leaves a stem, which is normal and does not change petal colour.
If the recipient in Chisinau dislikes the idea of treated flowers, a mixed bouquet of naturally coloured gerberas, chrysanthemums and tulips gives similar brightness with none of the argument. Rainbow bouquets are worth ordering when the reaction in the first minute is the point of the gift, and worth skipping when it is not.