First, they exposed three tubes of chrome yellow to UV radiation until one turned a chocolate color.
首先，他们将三管铬黄曝露在紫外线辐射中，直到其中一管变成巧克力色。
2
Another important tip is to separate your tubes of oil paints and acrylics so that you don't mistakenly take color from an acrylic instead of an oil tube.
另一个重要的秘诀是分开的油画颜料和丙烯的管道，这样你就不会错误地从一丙烯酸而不是石油管的颜色。
3
Quality control of color picture tubes may require the salvage and reuse of the glass envelopes.