"obvious traces" is correct and usable in written English.
You can use this phrase when you want to describe something that leaves distinct evidence. For example, "The criminal left obvious traces at the scene of the crime."
Initially, there are no obvious traces of the original ballet in Loch na hEala.
The bodies on display bore no obvious traces of bullet wounds; the shrouds had no blood.
A rough preliminary test, Major Handelman said, found no obvious traces of chemical weapons at the trailer.
It is apparent from this that most solutions eventually mix in with the rest of the hydrosphere and leave few obvious traces of their former presence.
By the time Pakistani soldiers lifted the cordon around Osama bin Laden's house in the garrison town of Abbottabad, triggering a media stampede, the most obvious traces of its infamous resident had been effaced.
Large clear-cuts and obvious traces from forest operations were little appreciated.
But these things tend to run deeper than the obvious, tracing to a development that probably didn't seem terribly important at the time.
Eschewing voice-over or any obvious trace of an on-screen or off-screen presence, she lets her images, a little text and other people do the talking for her.
Dutch police were last night trying to piece together how the thieves had entered the gallery, beating a top-of-the-range security system and leaving behind no obvious trace of a forced entry before swiping the works.
Though there might be some more professional artifices such as scaling, rotation, brightening, blurring, and smoothing after splicing, a careful and skillful splicing image can avoid any obvious trace of manipulation even without any of those above post-operations.
Although the edge of the AFM tip plays a main role in the scratching test, machining with such small feed leads to a small attack angle resulting in plowing machining state, no obvious trace of the cutting tool left at the bottom of the channel (see Figure 6d) and a relatively rough surface, which agrees well with previous study [18].
