Tradescantia 'Variegata' is a somewhat variable plant, and can range in shades from white, to cream, to pale lemony white. Fully white parts won't last long, as they lack the ability to produce energy of their own. If your variegata arrives with some crispy leaves, especially if they're fully white, simply remove them and allow new growth to emerge. Fully green parts should be removed at soil level so they don't take over the plant. Several other varieties can be treated this way, if they have lighter parts or tend to send out reverted shoots. This encourages variegation and keeps your plant looking its best.