There is no such thing as “black light wavelength”—so why do black T-shirts, black crayons, and black marking pens look black? Investigate a variety of black ink markers, and find out why they look ...
来自MSN1 个月
Govt debunks claims of RBI prohibiting use of black ink on cheques | Check rules on ink colourThe government has clarified that the Reserve Bank of India has not prohibited the use of black ink on cheques. The RBI has not prescribed specific ink colours to be used for writing cheques.
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