If infrared light is not visible to the human eye, why do most tv remote controls and security cameras appear to have a visible red colored LED lit when the infrared light is being emitted?

Is that visible red light present as a convenience (by grace of the component designer) or as a by-product of emitting actual infrared light?

Is it possible to have infrared light emitted without this visible red color?

If infrared light is not visible to the human eye, why do most tv remote controls and security cameras appear to have a visible red colored LED lit when the infrared light is being emitted?

Is that visible red light present as a convenience (introduced by grace of the component designer?) or as a by-product of emitting actual infrared light?

Is it possible to have infrared light emitted without this visible red color?

If infrared light is not visible to the human eye, why do most tv remote controls and security cameras appear to have a visible red colored LED lit when the infrared light is being emitted?

Is this only for user convenience - is it possible to have infrared light emitted without this visible red color?

If infrared light is not visible to the human eye, why do most tv remote controls and security cameras appear to have a visible red colored LED lit when the infrared light is being emitted?

Is that visible red light present as a convenience (by grace of the component designer) or as a by-product of emitting actual infrared light?

Is it possible to have infrared light emitted without this visible red color?