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Under a red light, blue would appear dark or black because red light is absorbed by objects that are not red. Since blue is not a color in the red light spectrum, it cannot reflect or be seen under red light.
A green object will appear dark or black under blue light because it does not reflect blue light well. Green objects absorb blue light, resulting in little to no reflection of this color.
A blue object under white light will appear as blue because it reflects blue light wavelengths and absorbs other colors. The white light contains all the colors of the visible spectrum, but the blue wavelengths are the ones reflected by the object, giving it its blue color.
In blue light, a yellow object would appear dark or black because yellow absorbs blue light and reflects other colors. This means that the object wouldn't reflect any of the blue light, making it appear dark.
A blue tie will appear dark and desaturated in green light due to the different wavelengths of blue and green light. The green light will interact with the blue dye in the tie to create a more muted appearance, potentially looking more grey or teal.
Nothing comes through. A red light emits no blue light, and a blue filter allows only blue light to pass ... that's why when you look at it, you say to yourself "Hey! That filter looks blue. I'll call it a 'blue filter'."