It is recommended to choose high-quality stains that do not alter the wood grain. Stains based on natural oil are often highly appreciated for their stunning effect. They easily penetrate the pores of the wood and dry slowly, allowing for adjustments if necessary. Allow for a drying time of about 24 hours before applying a finish. 

For antique furniture that you do not want to strip, gel stains are an interesting option. They adhere well to old varnishes and lacquers, and can be applied in several coats to achieve a darker and richer color. Gel stains also have the advantage of being based on low-odor solvents. 

Water-based stains dry quickly due to their aqueous solvent. If you are working on large pieces, it may be necessary to add a retarder to the stain to slow down the drying time. 

Alcohol-based stains are another option for obtaining deep and beautiful shades. They are made from transparent pigments (colorants) that never alter the wood grain, even after several applications. 

To achieve a successful result with stain, sanding is crucial. Make sure to sand deeply using multiple grits, and finish with a fine grit between 120 and 220, depending on the type of stain used. If you need to do touch-ups during application, do it quickly before the stain dries. The longer you wait, the harder it will be to correct mistakes.