Current waveform: usually filter, the better for the coating structure of uniform.

电流波形：通常滤波度越好，镀层组织越均一。

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Add filter aid agent and methods have pre-coating method and blends method.

加助滤剂和方法有预涂法和预混法。

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So the LEDs found in current household applications are blue diodes daubed with a powdered coating called a phosphor, which includes rare-earth elements that filter blue light.

所以，现在家用的LED是将蓝色的发光二极管的外壁涂上粉末状的磷，其中含有的稀土元素可以把蓝光过滤掉。

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A protective coating of colloidal silver is painted on the inside and outside of the filter to kill bacteria.

VOA: special.2009.06.22

Each disc is covered in a transparent plastic coating (either blue, green, yellow or red) which lets daylight filter through.

WSJ: Daniel Buren's Bright Periphery | 'Excentrique(s) Travail In Situ' at the Grand Palais in Paris