I really don't think the color of your kayak matters.  Mine is green/blue.  After my initial encounter on Aug. 1 2017 when I got slammed and blasted out of my kayak, I finally got the nerve to go back out at the same spot, with the same buddy, almost exactly 3 months later.  We were out about 30 minutes when an even larger white shark (14') swam alongside my port side, dorsal fin cutting the surface, turned hard around my bow, then swam along my starboard side.  I poked him (her?) below the dorsal fin with the tip of my 6' rod, that's how close it was to me.  Needless to say we paddled in. 
I have a theory that if you see a shark it isn't going to attack you, as they are ambush predators (albeit they are mistakenly identifying your kayak as prey).  If you see them they are just checking you out.  But I would, and did, paddle in.  It's when you don't see a shark that you need to be concerned - which is pretty much every time you are out in waters along this coast.  Especially Aug. thru December.  I have access to a nice boat now, and have decided to pretty much stop kayak fishing around here.  Definitely I don't recommend kayaking solo. 

I just saw this thread - see my recent GWS post in the General Info section - maybe the Administrator can move it to the appropriate forum.

Hopefully this is the correct forum to post this in - I'm new here.  I have been kayak fishing in California quite a long time (off and on for 40 years - honest), but something happened to me the other day that I thought was worthy of sharing with this group.  I usually kayak fish alone off the Pescadero coast (San Mateo county), and yes I know it is 'sharky' down there.  Fortunately I was fishing with a friend last Tuesday Aug. 1, and it was also fortunate that I was using my heavy Cobra Tourer model that day, rather than a lighter Tsunami 15' kevlar boat I usually use.  Things might have turned out differently if I had been alone and in that boat.  I'm going to copy and paste the objective write-up I have submitted to Ray Collier's Shark Research Committee which will give you the pertinent info of the event, which I'm sure will elicit many questions and comments, and I'll do my best to respond when and if I can.  And for the record - I suffered no physical injuries from the attack on my kayak.  I was previously aware of one other shark-kayak interaction in this area (off Bean Hollow), but I have since discovered 2 other shark-kayak events along this section of coast between Pescadero and Pigeon Pt.  Perhaps some of these folks are members here?

Unprovoked Shark Attack Report – Kayak

Date:  Aug. 1, 2017

I was kayak fishing with one other kayaker approximately 300 yards offshore, between Pescadero Pt. and the northern Bean Hollow State beach (37.2381N, 122.4217W).  Water depth was 30-35 feet.  I had just caught a fish, and had put it on a stringer with one other fish, and hung the stringer in the water just aft of my seat.  Without any warning, a white shark struck a few feet forward of the port bow of my kayak.  I saw about 3-4’ of the shark’s head come out of the water as it bit into the side of the kayak.  The force rolled my kayak over to starboard, putting me in the water.  When I surfaced my immediate instinct was to climb on top of my overturned kayak, but the shark was still engaged to the bow of the kayak and thrashing about.  Once the shark submerged I pulled myself on top of the upside down kayak, and my friend paddled alongside me.  I was not injured, but needed a few moments to assess the situation and my condition.  There was no sign of the shark, so I slipped in the water between our two kayaks, and as quick as possible flipped my kayak over and pulled myself aboard.  The center hatch of my kayak had not been latched down and had come off on impact, so my kayak had taken on a bit of water, making it sluggish but stable.  We gathered up my floating gear around us, and just as we were preparing to paddle into shore I saw a large ‘boil’ of water directly under my boat, which clearly indicated to me that a shark was still there.  I would estimate that from time of initial attack to this observation was 5-10 minutes.  We paddled towards shore and then northward along the shoreline to our put-in spot at Pescadero Point.  There are numerous bite marks and scratches on the bow of the kayak – photos available.

I would estimate the size of the shark to be approx 10’ or less, based on my view of the head – I never saw the entire body.  The boil I saw a bit later looked to me to be from a very large shark (I’ve had some experience working with research shark taggers at the Farallon Islands, and have seen a number of large white sharks from a small tagging skiff) – I can’t say for sure but based on the size of the boil this may have been a different/larger shark than the one that attacked the kayak.

Weather:  foggy, visibility ranged from <100 yards to ¼ mile, wind NW 5kts.
Air temp. 60F, water temp. 58F,  water visibility 2-3’, green color
Kayak:  Cobra Tourer model, 14’4”, blue/green color (other kayak was white, 12’)
Time of attack:  approx. 10:45am