The phrase "although it is visible" is correct and usable in written English.
You can use it to introduce a contrast or exception regarding something that can be seen or perceived.
Example: "The error in the report is significant, although it is visible only to those who know what to look for."
Alternatives: "even though it is apparent" or "despite being noticeable".
Although it is visible to the naked eye, it is only visible close to sunrise and sunset, and doesn't rise far over the horizon.
A small vessel may be hidden in the MIP image, although it is visible in the original 3D data [ 46].
In the top panel of the figure the underlying VF is corrupted by CPR artifacts, although it is visible in the 5 s interval without chest compressions.
Pd was not detected on the surface of any of the reacted samples by XPS analysis (Table 1), although it is visible in TEM-EDX maps (Fig. 5), and may be out of the sampling depth of XPS.
Consequently, B is underrepresented in the population histogram, although transitions to and from it are visible upon inspection of individual traces.
"Under present lighting in the gallery, the vertical strip of damage can hardly be seen when looked at straight on although it is just visible when the painting is viewed from the left side," Martin Bailey wrote in The Art Newspaper.
Meanwhile, unverified amateur video has emerged which purports to show ISIS fighters near the refinery - although it is not visible in any shots.
The large amount of water released and the resulting fibrillation of the water column obliterate the sedimentary pattern, although it is clearly visible in reality (c.f. e; photography by E. Bogason).
A variable nebula exists around the protostar, although it is only visible in infrared light.
A faint companion is in orbit around the red giant star, although it is not visible to the naked eye.
Charolais carry the red allele at MC1R, although it is not visible in the coat because of the dilution effect, whereas black and white Holsteins are predominantly homozygous for the black allele, with a low frequency of heterozygotes [ 3, 21].
