伍蓝德对此问题深深着迷，他的构想是利用紫外线墨水。
Woodland was fascinated by this problem and his idea was to use ultraviolet ink.
羽绒方的紫外线墨水是可以的费用要高达三倍，定期油墨中，必须有不同的处理比传统油墨由于安全问题。
The down side of UV inks is they can cost as much as three times that of regular inks and must be handled differently than conventional inks due to safety issues.
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