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There are many tips and warnings thrown around when it comes to interior design. Guidelines on mixing large-scale patterns, what colors to paint which room, and others have been floating around for ages. While there are no hard and fast "rules" for interior design, there have been several tips that have become accepted as best practices in the design scope and have become second nature. However, some of these best practices are past their expiration date, according to House Beautiful. Here are three practices that interior designers indicated should not be followed anymore. Do you agree with their conclusions?

Old-School Rule: Use the Same Metal Finish Throughout a Room
"Matching metals seems rather outdated now," says Megan Bachmann, a California-based interior designer. "I love mixing metals. It feels so fresh and current. Interior designer Dabito agrees, and says he doesn't think enough people feel comfortable going against this more traditional rule.

Old-School Rule: Follow the 60-30-10 Guide for Color
The 60-30-10 rule refers to using your main, focal color in 60% of your space, a secondary color in 30% of your space, and an accent color in 10% of your space. "I think it can definitely help people bring color into a space," Dabito says, "but I feel like that's limiting as well." He doesn't limit the number or intensity of colors he incorporates into any space.

Old-School Rule: All Wood Stains Need to Match
"Wood doesn't need to all match," Bachmann says. "It just needs to 'go.'" Matchy-matchy wood furniture can look cheap, and even worse, boring. Bachmann says this a rule some of her clients have a hard time breaking. She points out that mixing different woods "makes a room feel finished and layered; it makes it seem like the room came together over time."

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