Solarisation

Initially, the term solarisation was used to describe the effect observed in cases of extreme overexposure of the negative in the camera. Most likely, the effect was first observed in scenery photographs including the sun (e.q. sol, sun). The sun, instead of being the whitest spot in the image, turned black or grey

One artists who had used Solarisation is Man Ray. I have researched him there wise but I think that it can till go towards research even if I dont use the solarisation technique.  
  
I like how in his images not all of them are solarised. There is some variation of what is dark grey and