"careful blend" is a correct phrase that can be used in written English.
You can use it to describe an item, concept, or situation that is composed of multiple different elements that have been combined in an intentional and purposeful way. For example: "The chef put together a careful blend of spices to bring out the best flavor in the dish."
I design products using a careful blend of elegance, simplicity and intrigue.
It's the careful blend of those two qualities, wisdom and nerve, that makes sense for a business owner – especially at the outset of a relationship.
He said that the antenna he is now using is a careful blend of silicone and his metallic compound, the ingredients of which are a company secret.
THE social-market economy devised in Germany after the second world war, with its careful blend of market capitalism, strong labour protection and a generous welfare state, served the country well for several decades.
Authentic compost is a careful blend of nitrogen and carbon sources, turned frequently, kept moist but not wet, and screened for use — all reasons to buy high-quality bagged compost.
Presiding behind the L-shaped wooden counter at which most customers are seated, he proposes a series of dishes for lunch or dinner, each a careful blend of East and West, based on immaculate ingredients, imported as well as local.
The Inbal Dance Theater of Israel was created in 1950 to preserve and advance Yemenite dance and music through a careful blending of the old and the new.
The company's marketing strategy centers around the careful blending of commerce and culture, which is their principle of "merchantainment". The company begins its campaigns with brand philosophy, and then with the application of technology.
Be careful blending the hot cooked tomatoes.
Be careful to blend along the edges of your jaw, otherwise it'll look like you're wearing a mask.
Mr. Bush and Ms. Rice described their goal as "a balance of power that favors human freedom" -- a careful hedge blending the Kissingerian preoccupation, a balance of power and the Reaganite quest for human freedom.
