Hello, Maya！ When 红 and 赤 just simply mean colors, here are my answers : There are so many different kinds of 红 , for example 深红(dark red)；浅红(pale red)；朱红(vermeil) And 赤 is another 红 : 赤红, which means a little darker than vermeil. 比朱红色稍暗。 Hope my answers can help you a little. : )

In general, 赤 and 紅 means red and no need to concern how red they are. 赤 is the more formal term and literary. For example, if you want to translate "The Red Queen" from Alice in Wonderland, it would be more formal to translate it as 赤后 instead of 紅色皇后. Battle of Red Cliffs would be 赤壁之戰 rather than using 紅. On the other hand, 赤花 is too formal, 紅色花 is better.

Red and red are basically the same no difference so the following is some of the painter I found on the Internet's professional point of answer {Red is normal red, red is equal to deeper than red. Tell you the best way to identify! On your computer, click on All Programs → Accessories → Drawings → Custom Colors → Adjust the red hue there. Saturation. The deepest red is red and a little lighter than him red} And because I use Google I do not understand English translation, so I do not know the translation of the right